In their quest to build a rocket, Umika and her friends decide to visit Matataki, their classmate who is a skilled engineer, but doesn't attend classes. However, they soon find out that this mechanic's got one short fuse!
ch-ch-ch-ch-challenge you to a duel!
!أ-أتحدّاك لنزال
t-t-ti sfido a duello!
t-t-te desafio a um duelo!
вызываю тебя на дуэль!