After Kozue faints from embarrassment due to the wind blowing up her skirt, she wakes up with a shy and childish personality—"Nanako." The other residents make Ryushi babysit Nanako, and she proves to be quite a handful.
Source: crunchyroll
Shiratori Ryuushi is a young artist-in-training, about to start studying at a vocational school. Arriving at his new lodgings, Narutakisou, he finds himself the focus of attention for the collection of weirdos that inhabit the place. He also meets and falls for the landlady, Aoba Kozue, who seems to be both lovely and charming. However, Kozue is not what she seems to be... in fact, she's more.