Shimotsuki-san wa Mob ga Suki

"Only you are special." After school, Kotaro Nakayama returns to school to pick up something, and he finds Shiho Shimotsuki asleep in the empty classroom. Shiho is rumored to be the favorite of Ryoma Ryuzaki, a popular boy who has a harem of girls in class, even though she is always expressionless and no one has ever seen her smile. But now, her pale fingers are holding Kotaro's hand...⁉　 The beginning of a "secret relationship" between the beautiful heroine and a mob boy! (Source: GCN Bunko, translated)