I remembered a part in a manga but can’t find the actual manga. If someone could please tell me, I would appreciate it a lot! I remember that in the middle of the story, the main character go take a look at the school’s boxing club. The protagonist was probably weak before but was now strong. One of the members asked for a challenge. A lot of student went to witness the fight but the protagonist never fought with rules ( he was probably a street fighter). During the fight, the main character accidentally unleash something, probably killing intent, and scare his opponent big deal. Later in the manga, the protagonist needs advices from the boxing club and his friend makes them meet up, the mc and the member of the boxing club who fought him, on the roof of the school. I also think that a friend of the mc sees them. She is also the character of the love subplot, I think. I’m sorry for my bad english, but if you perhaps know the manga I’m talking about, please tell me! Thank you very much.

Might be Holyland but I'm not really sure.

Thank you very much!