Omr, I just had a thought.
After playing In, I realized I wanna do a crossover with it in YuGiOh. So here we go:
YugIb: the main character around 8 or 9 years old, visits the art gallery for the arts by an artist caller, Maxmillon Pegasus. He holds the red rose which symbolise his life, if the rose dies, he dies too.
Yamii: one of the characters supporting YugIb in his journey in the art gallery. Turning to be at the age 18 , he holds the blue rose, if that rose dies. He dies.
Teary: a mysterious girl who turns out to be a painting and the last work of Pegasus before he died. She holds a fake yellow rose and is a psychopathic maniac in the inside. That's what they call a Yandere.