俺の彼女と幼なじみが修羅場すぎる+H
byYuuji Yuuji(Story)·Shinya Inase(Art)
The story sets one month Eita and Masuzu start dating, and sets itself on a "what if" where the Harem element is stronger than in the original.
Ore no Kanojo to Osananajimi ga Shuraba Sugiru
Source