Boku wa ne.

Tetsuta's mother died when he was a small child, and after that his father always came home late from work. It had always been Tetsuta's wish that his dad would come home early. Then one day his dad anounced that they would be having a new babysitter to take care of them! Tetsuta was strongly against this until he met this beautiful babysitter...

(Source: MU)

Included one-shots:
Volume 1: Ai wo Kudasai
Volume 2: Haru ni Saku Hana