Black Rose
Once there was a boy named Natsume who fell in love with his childhood friend named Mikan. They haven't seen each other for several years. When they met, Natsume told Mikan how much he loved her since they were young.
Mikan knowing how much Natsume loved her, made a deal with him. She gave the Natsume a blue rose and promised him that she will love him if the boy would be able to turn the blue rose into black rose in three days.
Three days have passed and Natsume still doesn't know how to turn the blue rose into black and that day, he received the news that Mikan died because of an illness she had since she was a child. Natsume knelt down and cried as he realized that it was impossible for Mikan to love him and it is as impossible as turning the blue rose to black.
