The tale follows Kai, the oldest sibling of the Nekoya household, who experiences love at first sight upon encountering Kyousuke Suzuki. Kai frequently declares his attraction to Kyou-chan, his university peer, but is consistently met with rejection. As a sensitive member of his family, how deep will Kai's romantic feelings take him? Will Kyou-chan, who possesses striking beauty, ever reciprocate the delicate brother's affection?