Sunohara-sou no Kanrinin-san

Synopsis

Nishiki visits Ayaka and gives her two tickets to the aquarium. Later, Aki meets Nana, Maiko and Mea in town, and they go to a karaoke bar together. Maiko and Mea bring him into a photo booth, and take a picture of themselves kissing him. At Sunohara-sou, Nishiki and Ayaka, having spent the afternoon drinking, drunkenly cuddle and kiss; when the student council comes home, they make them join. Another day, Ayaka and Aki go to the aquarium and watch penguins together. Later, the student council takes turns role-playing as each other's and Aki's older sister while Aki tries to avoid mentioning his own sister.

(Source: Wikipedia)