Little Sister (Imouto)

Miya is concerned that her brother Junichi is going to be hopeless and lonely man in the future but is shocked when her friends Sae and Ai tell her Junichi is a nice and helpful person. Wanting to confirm if Junichi acts differently at school, she spies Junichi with Tsukasa, Rihoko, Kaoru, Haruka, Ai and Sae which proves it.