The Sleazy Master of Shenanigans

This book is also known as The Five-Way Dismemberment, The Manly Minami Brothers, and Monthly Girl Shibato.

See how Shiki Minami, who has trouble communicating with girls, tries to cure his problem (by going in exactly the opposite direction). See how Chiyo Sakura confesses to Shiki, who can't understand romantic signals.

(A slice-of-life fanfic featuring Kaguya-sama: Love Is War, Monthly Girls' Nozaki-kun, and Minami-ke.)

P.S. Look at the cover! Fifty yuan! That's how determined I am not to abandon this novel.