Shinju to No Kamigakushi Sore Ha Seigi Ga Yurusanai! (Kodansha Aoi Tori Bunko)

[Machine Translation] My name is Yui Suzumoto and I am in the first grade of junior high school. 3 years ago, I fell in love at first sight with my relative, Shinobu Nanaki, who saved my life when I was in danger. However, Shinobu-sama was the young master of the main family, a man above the clouds. Still, he wanted to be close to him, so he made a desperate effort and succeeded in moving in with the Nanaki family. Just when he thought he had succeeded, a rival appeared! On top of that, Shinobu-sama has left home and has no plans to return. And he has a fiancee! What's going to happen to my future? From intermediate level of elementary school.

私は鈴本結衣、中1です。3年前、危ういところを助けてくれた親戚の七鬼忍様にひと目ボレ。ところが忍様は、本家の若様、雲の上の人。それでもおそばに行きたい一心で、必死に努力し、七鬼家に住みこむことに成功したんだ。やったと思ったそのとたん、ライバルが出現っ!おまけに忍様は家を出ていて、帰る予定なし。しかも婚約者がいるなんてっ!私の未来、どーなるのっ!?小学中級から。