After returning to his home country in Japan for the first time in 15 years, Tasako meets his old childhood friends Mina and Meri, who have now grown and matured. After meeting them, he realizes they've been staying at his mother's old house and taking care of it after she died

Mina arranges a way for them to stay while he lives there, which involves her doing pleasures for Tasako, to which he accept

How will she hide this from Meri? Things are about to get crazy..