Great manga. Omega hit everyone who get close to bridge where under he has a box with cat. Once day there went a alpha who think that the other guy hit without any issue. When he discover he defense cat's territory he only left but start coming everyday bc he start having feelings for omega. They gone out and kiss occasionaly. Once a guy from alpha's school attack omega but alpha rescue him. After situation calm down he confess and bc he think omega has a girlfriend he never come back to underbrige apartment again. On the graduation day omega come to alpha's school and confess too. They start dating and as we know since a first page they were together and hava a cute daughter.
Shima-chan Chi no Tsugai Jijou