A collection of three one-shots by Shiina Karuho:

Koi ni Ochiru:
Sono Chika has never fallen in love, but a chance encounter with a classmate Kiyohara slowly changes things....

Saigo no Natsu:
Iwamoto Hazumi can't swim, so her school requires her to take remedial swimming lessons during summer vacation. Already drowning on her first jump into the pool, though, things are not looking good. Cue Ooumi Nariyuki-senpai to her rescue...or not?

Kane ga Naru:
Yoshitomo and Ginko are polar opposites and have not gotten along since they first met, but what happens when they each take charge of putting together a co-Christmas Eve celebration involving their two classes?