My Brother Loves Me Too Much (2017)

Trailer
The story centers around female high school student Setoka Tachibana, who has confessed her feelings to other boys 12 times, but has been rejected each time. Her older brother Haruka Tachibana cares for his younger sister deeply, but keeps a secret from her that they are not blood related. One day, Setoka's first love Takane Serikawa appears after many years and approaches her.