There are 8 books in the Blue Flag series. The newest book is Blue Flag, Vol. 8 which came out in 2021.

1
Blue Flag, Vol. 1

Book cover of Blue Flag, Vol. 1
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…
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2
Blue Flag, Vol. 2

Book cover of Blue Flag, Vol. 2
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…

3
Blue Flag, Vol. 3

Book cover of Blue Flag, Vol. 3
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…

4
Blue Flag, Vol. 4

Book cover of Blue Flag, Vol. 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.

Love is already hard enough, but it becomes an unnavigable maze for unassuming high school…

5
Blue Flag, Vol. 5

Book cover of Blue Flag, Vol. 5
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…

6
Blue Flag, Vol. 6

Book cover of Blue Flag, Vol. 6
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…

7
Blue Flag, Vol. 7

Book cover of Blue Flag, Vol. 7
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…

8
Blue Flag, Vol. 8

Book cover of Blue Flag, Vol. 8
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…