"First published in Japan in 2017 by Sheuisha Inc., Tokyo."--Colophon.

Publisher Marketing: KAITO began his manga career at the age of 20, when his one-shot "Happy Magi" debuted in Weekly Shonen Jump . He published the series Cross Manage in 2012. In 2015, he returned to Weekly Shonen Jump with Buddy Strike . KAITO started work on Blue Flag in Jump+ in 2017. Publisher Marketing : 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.

Format: Paperback | Pages: 248 | Publication Date: 2021-04-20