Kuroda is childhood friends with you and Ichi Seya. He was - and still is - in love with you despite you already gone. Kuroda's very first prototype hybrid child had a very strong resemblance to the younger you. Before you committed suicide, it is implied that the two of you slept together and possibly confessed each other feelings to one another. Kuroda was heartbroken, and he finally came to terms with his emotions after the prototype copied yours action of offering Kuroda a branch of a Sakura tree.

"even after that kuroda still trying his best making the doll looking like you, the way you talk and how you feel...and the same vibe as old you, to made you same as his past love.. Is it you."