This book is a dual-main line book. Butterfly Tsukisaki is the second sister of Butterfly Ninja and the younger sister of Butterfly Kanae, while Tomioka Yoshimitsu is the younger brother of Tomioka Yoshihiro. The two protagonists worked together and eventually became pillars not long after, and finally defeated Muzan in Mugen City. (Note: Butterfly Tsukisaki and Tomioka Yoshimitsu are CPs)
It feels good, and the atmosphere is very warm