Ooya Kazumi is mostly known for her short stories, and the Kazumi Kun No Poppu Appu Shiriizu is a collection of 4 books (some of which are loosely connected to each other) of short stories. Her stories are very cute, and always have at least one or two very cute guys. Many of her stories are about rock stars and the sort.

The main story of this is about a girl who one day is running late to the ATM, and bugs the boy ahead to be quick. Instead of letting her go ahead, he simply takes some money out and gives it to her (in a very nice way!). Later, she sees him around and drags him home, and he starts boarding with her and her sister. Naturally, he does have a past -- and just what is it? . . .