Himawari Youchien Monogatari: Aiko desho!

Hanatori Suimei, a ronin, came to his aunt's house to study for the next university entrance exam. Turn out the place he will be living in is a kindergarden ran by his aunt. There, he meets Aiko, an 8 year-old girl, Haru, a teacher there, and many other children. How will his relationship with Aiko, with Haru turn out?