Gimai Seikatsu 5 (MF Bunko J Mi 10-22) [Light Novel]

[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...?

誰にも知られてはいけない、二人だけの秘密の生活が始まった。兄妹のようで恋人のようでもある、名前をつけられない関係を育む悠太と沙季。自分の都合を押しつけたりせず、かといって抱え込みすぎもせず、適切に頼り合いながら、お互いに理想のパートナーでいようと試みる二人。初めてのデート、不慣れなファッション、友達の誕生日会、そしてハロウィン。様々な出来事を通して、同じ時間を過ごす中で、異性に期待せず生きてきた二人に少しずつ『変化』の兆しが見え始める。また周囲の人間も、徐々に彼らの『変化』に気づき始め...?