Yagami-san wa Kakushitai!!

Synopsis

A first-year high school boy, Nagumo Hassaku, gets called "Hakushaku-sama" because of his tall stature and intimidating appearance. He wants to make friends, but he has trouble talking to people, so he lives his high school life as a loner. Until one day, when he accidentally discovers the secret of Noa Yagami, the most beautiful gal in his class... When she gets excited, a large tail pops out! A heartwarming romantic comedy between a monster-gal and an introverted boy! (Source: Futabasha, translated)