My memory was kinda vague

but i think it was about a guy who confessed to many girls and got rejected, his friends just pity him and told him to stop confessing blindly to the girl he just meet.

the guy then meet a beautiful woman who works in convenience store

the guy then falls in love with her and every single days he always clean the front of the convenience store. Many people then call the guy as "diligent guy" and appreciate his effort, especially the beautiful woman.

i remember the guy meet some deliquent high school, and dunno how it resolved but after that, it revealed the beautiful woman already married and she was the wife of the onvenience store owner.

Then he meets some girl in the motor bike and somehow the guy fighting alien and having this power ranger suit thing and such.

the manga about super hero anyway and the guy become at it(forced and have this power ranger suit).