Looked forward to reading this after seeing the ratings and the description.
What no one wrote was the fact it's the typical shounen troope,
No change in the story except a few skipped fights due to the mc's input.
His parents and his "gf" wants to punish his behaviour at close to any turn they can due to comedy effect, just the fact his parent(s) wants to punish him for showing off at the sports festival is legit beyond me.
The writing quality is superb, except a few typos with names and stuff like that, the only thing that drags this fanfic down is the fact the logic used at every turn to force comedy is literally trash.
That said it's not a bad fanfic, just immature and aimed towards teenage readers.