Hikaru, a high school nerd with only one friend, must clean the school pool after showing up late; he meets the infamously lonely Iroha on cleaning duty and the two form a bond over their difficulty getting along with their classmates.

Hikaru struggles to navigate his budding relationship with Iroha.

Tsutsui struggles with his growing feelings for his real world girl and receives advice from an unexpected source.

Hikaru responds to an anonymous letter beckoning him to the school gym.

Tsutsui struggles to voice his feelings for Iroha; they deal with the aftermath of the mysterious letter.

Hikaru upsets Iroha and his best friend, Ito, and seeks a way to make amends.