[Machine Translation] A secret life between the two of them, which no one is allowed to know, has begun. Yuta and Saki nurture an unnameable relationship that is like that of brother and sister, but also like that of lovers. They try to be the ideal partner for each other, relying on each other appropriately without forcing their own needs on the other, or being too possessive. Their first date, unfamiliar fashion, a friend's birthday party, and Halloween. As they spend the same time together through various events, the two, who have lived their lives without expectations of the opposite sex, gradually begin to show signs of "change. And the people around them gradually begin to notice their "change" as well...?