Tokimeki Restaurant: Project Tristars

The story of the game is that you are a girl who just got a job at a cafe which happens to be next to an idol dormitory. In Japan, idols are young attractive celebrities that do one or a combination of singing/acting/modeling. In Tokimeki Restaurant (tokires for short) there are two boy musical groups called 3 Majesty and XIP. Both have three members and you meet them all in the intro story.