Based on the adult PC game by Orc Soft. After five years Kenta returns his former house. Now his uncle’s family lives there and he is supposed to stay there again because he plans to attend the nearby school. That means he’ll meet his older cousins, twins Saki and Maki , again who used to take care of him when he was younger. But to his surprise Saki and Maki have grown into very outgoing girls. Kenta quickly learns that his uncle got transferred to another city so it’s only the three of them in the house. Saki and Maki waste no time to approach him very aggressivly. (Source: VNDB)

Set in a rural town, Kouta is the only son and heir to the Mikomori shrine in the small redeveloping town of Tsumagoi-chou which had been declining in popularity. He didn’t have any interest in inheriting the shrine. Instead, he focused on his studies, aiming to be a civil servant upon graduation. His widowed father talked about marrying a young girl, but then he suddenly disappeared. That girl Erina came to live with him, along with her younger sister Motoka. With the help of his childhood friend Mio and a few supporters of the shrine, they managed to continue living normal lives. One day, Erina brought home a girl Mai, who called herself his fiancée. One thing led to another, culminating with Erina ordering him to get her pregnant.