Chiaki and Kazuma have a sibling-like bond, but it grows into something more. One night, during a sleepover, Kazuma hears strange sounds coming from Chiaki's room and discovers him pleasuring himself. Kazuma offers to help, which surprises and arouses Chiaki. As they explore their feelings, Kazuma notices an unexpected emotion on Chiaki's face. After their encounter, Chiaki is confused about his romantic feelings for Kazuma and avoids eye contact. Despite this, they continue to have casual physical encounters.
