It is completely platonic love. Mitsuri is like your mother to you because she had found you all alone under a cherry blossom tree. You Kira kanroji is now the daughter of the love pillar Mitsuri Kanroji! Also I'm writing this because there really isn't many stories about mitsuri story about her with a child reader. I'm just gonna take a little mental brake for a little bit, but I'll still try to update.
5 parts