With his parents away on a business trip, Kazuki was sent live with his big breasted, all female family members of the "Teshigahara" household.
He came to enjoy his new day-to-day life with the Teshigahara house, and even made friends at school.

However, all that changed when troublesome boys from a nearby neighbourhood showed up.

The boys continued to harass and bully Kazuki, and his new, peaceful life began to collapse around him.

It continued day after day-

And then, finally, Kazuki's sympathetic older cousin became involved...