Ore no Kanojo to Osananajimi ga Shuraba Sugiru

Ore no Kanojo to Osananajimi ga Shuraba Sugiru (俺の彼女と幼なじみが修羅場すぎる, lit. My Girlfriend and Childhood Friend Fight Too Much), also known as OreShura (俺修羅) for short is a light novel series that began in 2011. It got 3 manga adaptations within months, a fourth in 2012, and an anime series for it began in 2013 which has 13 episodes.

Episode 4
Both Chiwa and Masuzu show up at Eita's house. He is completely baffled as to why they are there, but both of them tell him they sent an email to him the night before, Chiwa to take a bath because her bathroom was broken, and Masuzu because she wanted to make him breakfast.