Book 1

Blue Flag, Vol. 1

by Kaito

Published 21 April 2020
An unexpected love quadrangle with a dash of unrequited love as two classmates, a boy and a girl, begin to fall for each other when each of their best friends have already fallen for them.

Love is already hard enough, but it becomes an unnavigable maze for unassuming high school student Taichi Ichinose and his shy classmate Futaba Kuze when they begin to fall for each other after their same-sex best friends have already fallen for them.

For some reason, Taichi Ichinose just can’t stand Futaba Kuze. But at the start of his third year in high school, he finds himself in the same homeroom as her, along with his childhood friend Toma Mita, a star athlete. But one day, Futaba opens up to Taichi and admits she has a crush on Toma. She then asks for his help in confessing to him! There’s just one problem—Toma seems to already have a secret crush on someone else.

Book 2

Blue Flag, Vol. 2

by Kaito

Published 23 July 2020
An unexpected love quadrangle with a dash of unrequited love as two classmates, a boy and a girl, begin to fall for each other when each of their best friends have already fallen for them.

Love is already hard enough, but it becomes an unnavigable maze for unassuming high school student Taichi Ichinose and his shy classmate Futaba Kuze when they begin to fall for each other after their same-sex best friends have already fallen for them.

The school sports festival is coming up, and Toma accepts the position of class 3-A’s cheer squad captain on the condition that Futaba and Taichi serve as his vice-captains. Hoping to live up to Toma’s faith in them, Taichi and Futaba diligently practice their squad’s routine. But when the time comes to perform, Futaba hits a wall that threatens her very participation!

Book 3

Blue Flag, Vol. 3

by Kaito

Published 3 September 2020
An unexpected love quadrangle with a dash of unrequited love as two classmates, a boy and a girl, begin to fall for each other when each of their best friends have already fallen for them.

Love is already hard enough, but it becomes an unnavigable maze for unassuming high school student Taichi Ichinose and his shy classmate Futaba Kuze when they begin to fall for each other after their same-sex best friends have already fallen for them.

Toma gets seriously injured diving in front of a car to save Taichi, leaving Taichi racked with guilt over not just getting his best friend hurt, but also stealing his last chance at making the summer baseball tournament. Guilty and angry, the two boys clash in an emotionally raw argument. Futaba, worried about both of them, invites Taichi out in an attempt to cheer him up.

Book 4

Blue Flag, Vol. 4

by Kaito

Published 12 November 2020
An unexpected love quadrangle with a dash of unrequited love as two classmates, a boy and a girl, begin to fall for each other when each of their best friends have already fallen for them.

Love is already hard enough, but it becomes an unnavigable maze for unassuming high school student Taichi Ichinose and his shy classmate Futaba Kuze when they begin to fall for each other after their same-sex best friends have already fallen for them.

Toma’s older brother, Seiya, asks Taichi to find out why Toma doesn’t want to go to college. On the day of Toma’s release from the hospital, Taichi still hasn’t found a way to broach the subject with Toma. Meanwhile, Futaba discovers Taichi’s birthday is coming up, and she decides to invite the group to a fireworks festival so they can all celebrate.

Book 5

Blue Flag, Vol. 5

by Kaito

Published 24 December 2020
An unexpected love quadrangle with a dash of unrequited love as two classmates, a boy and a girl, begin to fall for each other when each of their best friends have already fallen for them.

Love is already hard enough, but it becomes an unnavigable maze for unassuming high school student Taichi Ichinose and his shy classmate Futaba Kuze when they begin to fall for each other after their same-sex best friends have already fallen for them.

School is back in session after summer break, and Taichi and Futuba are slowly transitioning their relationship from friends to something more. Suddenly, Mami starts being unusually friendly with Taichi, leaving Futuba feeling anxious. Taichi, unsure of Mami’s true intent, can’t help but get dragged along in her wake. Their situation attracts attention, more people become involved and soon everyone is questioning everyone else’s relationships!

Book 6

Blue Flag, Vol. 6

by Kaito

Published 1 April 2021
An unexpected love quadrangle with a dash of unrequited love as two classmates, a boy and a girl, begin to fall for each other when each of their best friends have already fallen for them.

Love is already hard enough, but it becomes an unnavigable maze for unassuming high school student Taichi Ichinose and his shy classmate Futaba Kuze when they begin to fall for each other after their same-sex best friends have already fallen for them.

The culture festival begins, and Toma and Taichi talk about their futures, but it ends with the two not quite seeing eye to eye. Shortly after, Toma sits down with Mami for a serious discussion, and in response to her earnest openness, he makes a big decision that could change everything. Time keeps moving forward, pushing everyone to the cusp of making critical life choices.