Kanojo x Kanojo x Kanojo: San Shimai to no DokiDoki Kyoudou Seikatsu

Haruomi Shiki's peaceful life on a small island was shattered when a volcano erupted and destroyed his home. He goes to stay with a relative, where he meets the sexy sisters Natsumi, Akina, and Mafuyu Orifushi, who he immediately finds himself attracted to.