Comment by wwweston

Possible:

https://theotakubox.com/blogs/articles/chuunibyou-eighth-gra...

I'm reading it as developing a level of capability which may (or may not) be genuinely accomplished but lacks requisite perspective and humility regarding its limits. Young teens (as in the 8th grade range) are famous for displaying this, and of course capable adults find it an easy mistake to make at many points in life.