From Baka-Updates Manga:

It's 3 oneshots linked by the common theme of gashapon and some of the characters being friends with one another and/or attending the same school.

• Love Gashapon
On the first day that Yuhan moved into her new home, she discovered a window in her room that looks across directly at a neighbor's window. From that neighbor's window a mysterious shadow lurks...

• Love Capsule Toy - Welcome, First Love
YanZhu is a very shy girl, who has always liked her senpai but didn't have the courage to confess. It isn't until Valentin's Day eve, after she bought a toy at Monmon's shop, that she finally got up the courage to confess, who knew...

• Love Capsule Toy - A Prince without the Glass Slipper
Zhou ZiYu is a playboy who has never refused anybody, so he has countless number of ex-girlfriends. He is this kind of guy, yet he meets his soulmate at a masque ball?
This is the longest of the stories, has 3 parts.