Book 1

Rainbow Days, Vol. 1

by Minami Mizuno

Published 6 December 2022
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Excited to have plans on Christmas Eve, Natsuki feels like he’s finally catching up to his friends who are in relationships. But when the night doesn’t go as expected, the stage is set for falling in love.

Book 2

Rainbow Days, Vol. 2

by Minami Mizuno

Published 7 February 2023
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Natsuki, Tomoya, and Tsuyoshi make progress in their respective romances. A girl confesses her feelings to the recently dumped Keiichi, but is she prepared for his role-playing proclivities?

Book 3

Rainbow Days, Vol. 3

by Minami Mizuno

Published 4 April 2023
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Tsuyoshi is busy trying to finish drawing his manga before a big summer convention, so Natsuki, Mattsun, and Keiichi go to his house for the night to help. Will Tsuyoshi make the deadline, or will his three friends just cause more chaos for him?!

Book 4

Rainbow Days, Vol. 4

by Minami Mizuno

Published 6 June 2023
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Is love in the air for Keiichi at last? A beautiful school nurse has captured Keiichi’s heart. But his older brother—a teacher at Keiichi’s school—is fiercely against the match!

Book 5

Rainbow Days, Vol. 5

by Minami Mizuno

Published 1 August 2023
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Relationships progress as everyone sets off on an overnight trip to an amusement park. Natsuki and Anna find themselves alone together in a rising Ferris wheel cabin…!

Book 6

Rainbow Days, Vol. 6

by Minami Mizuno

Published 3 October 2023
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

The overnight trip to the amusement park has brought Tomoya and Mari closer together. Tomoya is hoping to take the next step with Mari as the school sports tournament heats up, but when she catches him in a compromising situation, things start to go sideways. Meanwhile, Natsuki prepares for a Christmas Eve date with Anna…!

Book 7

Rainbow Days, Vol. 7

by Minami Mizuno

Published 5 December 2023
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Ever since Natsuki kissed Anna and collapsed with a fever on their date, she’s been anxious to find out what was on his mind. When she finally hears from him, she’s shocked to learn that he can’t remember a thing!

Book 8

Rainbow Days, Vol. 8

by Minami Mizuno

Published 6 February 2024
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Nozomi may have been rejected (apparently) by Keiichi, but her feelings are stronger than ever. Newly determined to win his heart, she enters Seiryo High. Meanwhile, her older brother, Mattsun, has his own high school love troubles! As Natchan and the gang start their third year, they reminisce about how they all became friends…

Book 9

Rainbow Days, Vol. 9

by Minami Mizuno

Published 2 April 2024
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

The gang sets out for their senior trip to Osaka and Kyoto! With Mocchi from the basketball team planning to ask Anna out during the trip, Natsuki decides to reveal his feelings for her too, but can he find the right moment? A white-hot battle of hearts over Anna ensues!

Book 10

Rainbow Days, Vol. 10

by Minami Mizuno

Published 4 June 2024
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Mocchi from the basketball team has asked Anna out! Afterward, Natsuki finds himself helpless in stopping his friendship with Anna from becoming awkward… Meanwhile, Mattsun notices Mari’s feelings are gradually changing, so he decides it’s time for them to have a serious talk!

Book 11

Rainbow Days, Vol. 11

by Minami Mizuno

Published 6 August 2024
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

It’s Keiichi’s time to shine on Sports Day! But when he sees Nozomi enjoying volleyball practice, he can’t understand why he feels strangely unsettled. Meanwhile, Mari has a big confession to make!

Book 12

Rainbow Days, Vol. 12

by Minami Mizuno

Published 7 November 2024
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Mari has told Anna that she’s in love with her. Will their friendship now change, and where does that leave Natsuki and Mattsun in their unrequited loves?

Book 13

Rainbow Days, Vol. 13

by Minami Mizuno

Published 16 January 2025
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

It’s now or never for Natsuki! Will he manage to tell Anna how he feels about her before the school festival is over? And how will she react?

Book 14

Rainbow Days, Vol. 14

by Minami Mizuno

Published 27 March 2025
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Second term is here, and everyone is starting to think about college, but Keiichi somehow can’t find his motivation… Tsuyoshi has decided on his future plans, but will his girlfriend agree?

Book 15

Rainbow Days, Vol. 15

by Minami Mizuno

Published 22 May 2025
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Something is clearly bothering Keiichi as he listens to the others discuss their college plans. Can his friends help him out of his gloom? Graduation is almost here, but what does the future look like for the Rainbow Days gang?

Book 16

Rainbow Days, Vol. 16

by Minami Mizuno

Published 17 July 2025
Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn’t be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

After graduation, Tsuyoshi and Yukiko go apartment hunting in Tokyo, Keiichi and Nozomi have their first date, and Tomoya and Mari watch a movie at home. When at last the whole gang goes on a graduation trip together, will Natsuki and Anna find time for romance?