#00.5: [理由は何でしたか？] What was the reason?

In his childhood, Shiro wasn't always into books, but his friend, Hana [Boy], encouraged him to study and lead a good life in the overworld. Shiro studied so much that every time he studied took all of his time and was no longer able to play with his friends, especially Hana.

Then came his coming out party, Shiro saw Hana once more, he also saw Ryuu, Mai, and Hikaru, but not Himari. In anger, he didn't attend Himari's coming out party even though Hana invited him.

Years later, Shiro developed hatred towards Himari, for such a mere party that she didn't attend, it's quite childish. And so tried to forget his hatred by not minding it at all, he started enjoying his middle school years until the third year came. He was with some friends and one of them introduced him to Miyanagi Tomoe. The longer he spent time with her the more he forgot about his anger and a few months after, Tomoe confessed and they dated.

Shizuku caught wind of the news and headed to stay with her brother for a while but every night, she goes missing, only to come back the next day.

One night, Shiro received a message from Tomoe's phone. A video was sent, the contents were gory, Tomoe was being filmed by her own phone, her blood was on the floor, she had broken limbs and she's ventilating. Shiro rushed to her but he won't be able to chase the assailant down in front of her even if she's beaten up. Instead he took her to the hospital and let her heal there.

When Tomoe recovered, she was told that Shiro had already moved to a different school because of what happened to her.

A few years later when Shiro was a high-school freshman, his father and the other kings decided that he will take the crown of Himari's father, Akuma Eiji and become the next Supreme King, and a lot of demons including Demon royalty opposing the idea, and Eiji told them about the incident that happened when Shiro was born, pushing them into a corner where they can't answer back.