Blue Flag, Vol. 4, Volume 4

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. It's the last year of high school, and love is in the air. Romantic feelings that have been building up over years of friendship come to light. When Taichi's classmate Futaba asks him to help her confess to his best friend, Toma, it sparks the catalyst that begins the sweet and heart-wrenching journey of their third and final year of high school.

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 there.