Naoya Mukai has recently begun dating his childhood friend Saki Saki. Another girl, Nagisa Minase, confesses her love to him, but he turns her down. However, when she decides not to give up, Naoya finds her so cute he decides to convince Saki to accept Nagisa as his second girlfriend. Saki is so overwhelmed by Nagisa's cuteness she insists on becoming friends straight away. Naoya manages to explain his desire to date them both, and though Saki punishes him, she is eventually convinced by Naoya's honesty and Nagisa's cuteness and gives permission...