H02163 Imouto Jiru Ep 1 - Akira's New Family and the Goddess Inana

Akira's father, an archaeologist, remarries and gains a stepmother and three stepsisters, Yuki, Nana and Miu. The father leaves Akira alone with them after a find on his honeymoon. In bed with his stepmother, Akira finds a scroll and three bottles, reads Sumerian, and makes a contract with the goddess Inana to collect his sisters' love juices before the next full moon.