The Manga is a shounen about a guy whose male friend goes murderous for a reason, kills people and kidnapped their mutual female friend. Male friend has the ability to punch holes through things. MC doesn't have powers, as far as I remember. MC decides to go looking for the both of them, wanting to rescue the female friend and reason with the male friend.

On the way, he meets a kid who has the ability to make invisible boxes, which he uses to trap the inhabitants of a dinner. MC, prior to that, had hitchhiked and was picked up by a female truck driver with a kid. He told her his crazy tale and became close. Later on, once freed after nearly suffocating, the kid tried to take the lady cause she reminded him of his mom. MC uses talk-no-jutsu to get the kid to let her go and they partner up.

I'm no angel, but I'm more pure than you.

Found it! I totally forgot the suicide aspect of it.

https://www.mangaupdates.com/series/3nbkh0e/alive-saishuu-shinkateki-shounen

I'm no angel, but I'm more pure than you.