Touhoushinki is the second strongest boy in Oga’s school. As we all know, Oga won Kanzaki in Beelzebub Episode 3, so Touhou wants to beat Oga to be the strongest boy in their school.
At first, he catches Hilda known as Oga’s wife and Furuichi and takes them hostage. After told Hilda and Furuichi’s location, Oga goes there and fights again. He says that friends’ safety is more important than his commitment. Finally he beats Touhou and saves them.