1화: 나오키가 소꿉친구 사키와 고백자 나기사에게 다자간 관계를 제안한다

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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. Naoya suggests they move in together as he lives alone. On the first night, Saki is impressed by Nagisa's housewife skills, but is slightly jealous of her larger breasts. Nagisa offers to let Saki sleep with Naoya first, but Saki admits their relationship is not sexual yet. This leads to an awkward conversation where Naoya admits he would like a threesome. Saki admits she is tempted because of Nagisa's cuteness, but still insists Naoya is a pervert for suggesting it. Naoya decides to delay having sex until they are all more comfortable with each other, but is surprised when Saki seems disappointed, though she violently denies it. (Source: Wikipedia)