Okusama wa Moto Yariman - Season 1

Based on a doujin game by Orcsoft. Yuuto resides alone in his apartment complex, finding companionship with his neighbours Megumi, Anna, and Mako. While he appreciates their company and their attractive appearances, he feels somewhat disappointed that they consistently regard him as a child rather than as an adult man. This dynamic shifts on the night of his birthday. After the three women host a party for him, Megumi informs Yuuto that, as a birthday gift, she will do something special for him. This event marks the start of Yuuto's intense summer vacation spent with these three buxom women.