Seikatsu Kojo in Kai! 1 (Kodansha Aoi Tori Bunko)

[Machine Translation] Mikoto is enjoying her life as a "loner" under the watchful eye of the queen of the class. A new transfer student with a very unique personality appears on the scene, and for some reason, she becomes a "Life Improvement Committee member"! She says her job is to solve everyone's problems and help them have a "better school life". But there is no such thing as a consultant, I thought, but the bad delinquents and the high spirited girls all have their own problems! Can Mikoto solve those problems? From intermediate level of elementary school.

クラスの女王さまににらまれ、“ぼっち”生活を「満喫中」の美琴。超・個性的な転校生の登場によってなぜか「生活向上委員」に!?みんなのおなやみを解決して、「よりよい学校生活」を送れる手伝いをするのが仕事だっていうけれど。相談者なんているわけがない、と思っていたら、ガラの悪い不良も、高飛車女子も、みんなみんな、なやみがあって!?そのなやみ、美琴に解決できるの!?小学中級から。