The Reason Why We Kiss

I kiss my childhood friend every day. One day, Ryuka, a high school student, kisses his childhood friend Hotaka in an “accidental kiss”. Ryuka tries to forget about it, but his body has been in great shape since that day. On the other hand, Hootaka, who has been in a slump since then, asks him if the kiss was the cause. The two are troubled and decide to “try” kissing again. But it's been that way since then. A kiss changes their relationship... A kiss is the beginning of a pure love story between two childhood friends.