In Those Days You Were Angsty: Age 15, Hozuki. After beating up someone who called him a good for nothing orphan, Hozuki and his friends Yomogi and Uzu ditch a school test to go to an auction of a cursed iron club at the black market. They reach it but are discovered by a giant demon as they go to leave - the brother of the demon Hozuki beat up earlier. After being called a worthless orphan who got himself sacrificed (again), Hozuki takes the iron club and beats them both up. He leaves with the club - the one he still carries today.
Dr. Bird Head: The Engineering Department is making a ruckus and Hozuki explains to the Zashiki Warashi they make the torture devices used in Hell. It turns out to be Uzu, who is working with Yomogi to see if they could make a mechanical minion - geisha actually. The friends are arguing over how big the breasts should be, much to Hozuki's annoyance.