Replica Datte, Koi wo Suru.

In a world where a substitute for Sunao exists, the replica steps in whenever Sunao is unwell or unwilling to attend school. This secret life is maintained until the replica encounters Sanada, a classmate. They begin a friendship, but Sanada soon notices the replica's unique qualities, setting her apart from the original Sunao. The replica instructs Sanada to only speak with her when her hair is half-up, and they begin to spend time together. As their bond deepens, the replica experiences feelings of love for Sanada. However, she is uncertain about her future, as she is merely a replica, and the implications of her emotions. The story explores themes of identity, belonging, and the complexities of love.