幼馴染と生意気義妹 ～ブルマと水着の誘惑～

The world is full of choices.
Right or left, front or back?
Big breasts or small breasts?
We are constantly forced to make such choices.

Kurami Jun is confessed to by his childhood friend and his step-sister.
Extremely indecisive, he is unable to choose which one to date.

So the two try every trick in the book to win Jun over.