Studio " Houkiboshi(Yubisaki kara Honkino Netsujou: Osananajimi wa Shouboushi) "announced a hentai anime adaptation of the manga" Overflow ~Iretara Afureru Shimai no Kimochi~ " from a fairly well-known author Kaiduka. 

The main character of the story is an ordinary College student Suda Kazushi, who lives in an apartment building next to the Shirakawa family. Kotone and Ayane have been friends with our hero since childhood and perceive him as their older brother. Therefore it is not surprising that the sisters constantly live in sudo's apartment and periodically arrange all sorts of depraved adventures for Him!