As Mari and Kouzuki Yuki are working at their part-time job in Akihabara to earn money for a buzzer set, Shiki and Inoue arrive in the area to train themselves with a quiz bowl game in the arcade. They're battling against a player called "Second Lieutenant Chisato" when Ashiya shows up, and the pair finds out that their opponent is someone they know quite well. Then a strange, somewhat suspicious character approaches the group...
the opponent you guys
 are facing right now...
...الخصم الّذي تواجهانه الآن
euer Gegner hier ist …
su oponente
vuestro oponente
l'avversario che state sfidando
vocês estão jogando agora contra
вы сейчас сражаетесь против...