Right now, I'm really desperate to find this manga. I read this manga already but I forget about the title. My memory is a bit blur so I will try my best to explain it. As a I remember, the manga genre is fantasy and romance. The manga is about a girl who become a mahou shoujo. Not willingly but forcefully. The guy who forcefully change her into mahou shoujo looking for a book. Also the house ( or school ) that she live in have an underground library or something that she don't it exist. I think this manga is a little bit smutty ( or not ) because I remember the guy who change her take her virginity. Also this rival who pervertly obssessed with girl. I remember that rival wearing a megane. The art is very outstanding. It was very cute and all male characters are hot. I also remember the guy that change her is from a secret organisation that I don't remember it name. Cross something like that ( or maybe I wrong. Not sure ) ~~ I hope you guys can help me finding this manga. I regret I don't write the manga title. 😢 🤢

¤ I'm a female human that want to explore the universe so I can find another Earth. ¤
♢ I'm a female human that want to sleep underwater cuz I find it surprisingly calm ♢
% I'm a female human that want to become a scientist but I can't because I don't like math, add-math and physics. %
@ I'm also a female human that just to stay in my room and wasting my time with favourite anime and manga. @

I'm also a female human that obsess with reverse harem related.

Himitsu no Bara Juujidan this one?

DONDAKEE!!

OH MY GOD!!!! OH MY GOD!!! THANK YOU VERY MUCH!!! >◇< ~~~~ YOU SAVE ME!!! YOU SAVE MY MENTALITY!!!! THANK YOU VERY MUCH!!!!! ARIGATOU!!! YOU DON'T KNOW HOW MUCH IT MEAN TO ME ~~~ I'M GONNA DIE!!!!! I LOVE YOU SO MUCH!!! ♡♡♡♡♡♡~ FINALLY!! FINALLY!!! SOMEONE ANSWER MY PRAY!!!!! >◇<

¤ I'm a female human that want to explore the universe so I can find another Earth. ¤
♢ I'm a female human that want to sleep underwater cuz I find it surprisingly calm ♢
% I'm a female human that want to become a scientist but I can't because I don't like math, add-math and physics. %
@ I'm also a female human that just to stay in my room and wasting my time with favourite anime and manga. @

I'm also a female human that obsess with reverse harem related.