Working!!

Synopsis

Otoo brings back a mysterious girl who says her name is Aoi Yamada and is 16 years old, the same age as Souta. Although Popura and Inami accept Yamada as a new member of Wagnaria, Souta has his reservations. Yamada constantly exhibits clumsiness and a lack of common sense, and as a result Souta and Satou take an immediate disliking to her. Yachiyo befriends Yamada, whom she takes to be a mother-figure, while Otoo is her father-figure. Yamada tells Yachiyo that Satou has feelings for her, which later culminates in a disastrous confession by Satou and a denial by Yachiyo. Popura gets the two of them together the next day, and Satou decides to tell her a subtle white lie to calm Yachiyo down.

(Source: Wikipedia)