It's summer, and Miki's relationship with Hiro is hotting up! As Miki is drawn further into Hiro's world, she starts to learn the reality of his delivering job. When Hiro takes the flame of love from a couple at school she doesn't particularly like, and gives it to a new pair, Miki is fascinated. But when he starts following her friend Yumi around, and Yumi's boyfriend starts hanging around with a new girl, Miki feels more emotionally involved. And she's about to learn to her cost that emotional involvement doesn't mix with delivering. Meanwhile, Hiro is getting visits from Reika, an attractive fellow deliverer. Can Miki keep hold of her man?