Hikari came from a really wealthy family, he technically was a millionaire. However, his parents did really love him.. they just.. didnt have enough time for him which caused him to think he was a bother. He grew up as a shy quiet boy and only relied on his friend. However, that 'friend' took advantage of him at his 14th birthday and forced him to do intimate things which traumatized the hell out of him. He didnt wanna be taken advantage of again so he started bullying others to look tougher.