Kimi ga Suki Plus

From Chibi Manga and Evil Flowers:

Story 1: Christmas Version - Aki wants to go on a trip with Mase, but they have no money for it so they decide to get a part time job. Unfortunately, not many are ok to hire high-school kids. Aki gets a job at a bar owned by Mase's brother, that doesn't think she is worthy of being the girlfriend of his little brother. She is determinate to prove him wrong and spend the best Christmas with her boyfriend.

Story 2: Passion Pink Version released in Genshoku Tsundere Danshi Semekare by Chibi Manga.

Story 3: Koibana Confession