A Secret Within a Secret!

Synopsis

Set in a hot spring town lined with public bathhouses, the protagonist, a picture book author, suddenly finds himself living under one roof with half-sister twins. There’s Koi, the innocent younger sister with a bedwetting habit she can’t shake, and Hazuki, the older sister who is shy and earnest. Surrounded by these sweet-smelling girls, he finds himself unable to resist their charm despite telling himself “this is wrong.” Thus begins the protagonist’s descent into becoming a naughty older brother.