Nina, Aki and Sakuya are inseparable childhood playmates, but one day, Sakuya just ups and vanishes. Even after six years have passed, Nina still can't accept Sakuya's mysterious disappearance. Aki tries to support Nina, and so, they agree to return to the day when Sakuya went missing...

(Source: MU)

Included one-shots: Yoakemae, Kimi to Mirai no Tsuzuki, Karakasa Biyori