there isn't much else to say, it's a pretty standard romance/sport manga, the two are shy and it takes forever for them to do any progress and everytime an actual match happens, it's the usual "i must become stronger/put more effort for love" since it's a romance too
they both start getting serious about the fight but.....
in Chapter 50, Karin and the demon classmate (a girl called Aki) go to a boxing gym in order to get some exercise (a recurring theme in a lot of these entries) as they wear sexy tank tops and boxing shorts, they dick around the boxing gym while attracting a lot of attention
The author of Aharen-san being suspicious again in Seikai Sefuku
こちらのツイートにはセンシティブな表現が含まれている可能性があります。
volume 2 ends with shinichiro getting closer to hana, but sadly volume 3 is nowhere to be found, i imagine Hana has finally the fight she wants and Shinichiro confess, but until it comes out to light all i can do is speculate
from here on, i'm not sure what happens but they do meet another girl kickboxer, it's funny i mentioned saotome senshu at the start of these post because she does looks like a character from saotome senshu
こちらのツイートにはセンシティブな表現が含まれている可能性があります。
Shinichiro learns the truth behind Hana cancelled matches, apparently she pissed off some big shot gym owner while being drunk by exposing her fake tits