Responses
All it took was the accident and the lost of his eye to change him though, unfortunately.
right - it's very sad that it took such a life-changing experience for him to grow up. There are multitudes of ways to grow from an immature brat to a self aware person, but here...T_T *cries*
http://www.mangago.zone/read-manga/nanohana_boys/nbt/c026/pg-23/
Also - I don't really like this line here: "it's really not a big deal". Like I get that it's trying to portray Onishi as this saint, but honestly, it's a big deal and he did not look away from it. Most people will avoid such situations and think, well it's probably not a big deal - the way you would when you see a fight on the street or something weird but brush it off.
If it wasn't a big deal, why would he bother going to his dad for help and so on?
One more thing - I'd feel so extremely proud of Onishi as his dad because he's really changed. He changed from a nonchalant delinquent to a genuine guy who cares for his friend and took actions for him! <3 <3