Wagamama High Spec

Protagonist Kouki Narumi is a high school student who also writes a manga serialized in a certain weekly publication. Kaoruko Rokuonji is the student council president and illustrator for a popular manga. One day, just as Kaoruko happens to be trying to recruit a male student council member, she learns Kouki's true identity and the fact that it's his manga she has been illustrating. Kouki agrees to join the student council under the condition that she keeps his identity secret. Then his younger sister, Toa Narumi, and her friend Mihiro Miyase also join the student council... (Crunchyroll)