Hello Kitty no Suteki na Kyoudai

Mimmy develops a shy crush on a boy named Robert, and Kitty eagerly tries to help her sister get closer to him. The plan becomes tangled when Robert mistakes Kitty for Mimmy, and an attempt to protect Mimmy's feelings only creates more misunderstandings. As the sisters' good intentions begin working against them, Kitty and Mimmy learn that supporting each other does not mean pretending to be someone else.