@Daniel Thomas ( the little kid ) thought the brown haired guy ( forgot his name ) is his mom while he was out on a drive with his dad ( the chief Yakuza called daiki ) and his Yakuza bodyguards. Daiki brought brown haired guy to live with him in the same house and look after Thomas for a year while he paid off the brown haired guys debt which his BF caused him to be in exchange for him looking after Thomas. Blue haired guy is thomas' new teacher BTW. Hope you understand now π