Seitokai Tantei Kirika
BloodyGaikotsu last edited by BloodyGaikotsu
Publisher: Kodansha LIGHTNOVEL
Kirika Hijiribashi is the Executive Committee Treasurer managing a high school's student council budget of 800 million yen. She is also the only committee member with an additional title: Student Council Detective. As shy as she normally is, she is able to sniff out amazing solutions to bizarre cases.
Hikage Makimura transferred into the same high school to escape living in the shadow of his brilliant older sister. Suddenly, he finds himself tricked by the mentally and physically strong female President into not only joining the Student Council, but also becoming Kirika's assistant, to the dismay of them both.
Can he create happiness for himself, much less others, in the midst of money-motivated intrigues? Can he make a name for himself when his own name is given to the the lop-eared bunny somehow filling the PR position, a rank higher than his own? And when will people stop asking him to betray a position he never wanted in the first place!?
Kinda similar to Hyouka, solving small-scale mystery cases with some drama here and there.
Inferiority complex is one of the biggest theme
It has manga adaptation for people who wanna see what the story is about
Oh I know about this. I took notice of this series due to how similar the art looked to the of Oregairu's which is nothing surprising considering Ponkan worked on both.
Also I see you are requesting every mystery novel lol.