I've Begun My Training!
S1, E9: Issei and Asia have just 10 days to learn all they can about devils and hone their skills before the Rating Game. The intense training leads Issei to invent a secret weapon.

S1, E9: Issei and Asia have just 10 days to learn all they can about devils and hone their skills before the Rating Game. The intense training leads Issei to invent a secret weapon.