Hiroyuki is staying with his aunt Manami in Tokyo to attend a welfare vocational school. Although they are aunt and nephew, Manami has always been kind and Ke'ai on him, and she is Hiroyuki's first love, so he was looking forward to staying with her in many ways... However, Hiroyuki is getting more and more annoyed with Manami, who still treats him like a child. However, it was all a trap set by Manami, who saw through Hiroyuki's ulterior motives...