Ep. 3: Rin esconde sua cauda enquanto Yukio o alerta antes de uma pegadinha em Shiemi dar errado

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In the dorm, Rin is hiding his long tail that is wrapped around his chest and examining it. Yukio warns him to hide it well or else people will notice. Rin opens his shirt as his tail wags back and forth like a cuckoo clock. He jokes about it but Yukio threatens Rin holding a slipper. In the classroom, no one is there except Shiemi, who is studying. Rin peeks from behind and creeps toward her. He smirks having an idea. Rin clutches his stomach when Shiemi notices him. She asks what's wrong when suddenly, something is poking out from Rin's back inside his shirt. Shiemi is surprised and scared as the bump is popping from Rin's chest. He is lying on his knees seemingly in pain as he calls out to her. Shiemi looks in horror, wondering what is happening to him. Rin reaches out begging for help as the thing inside Rin is bursting out multiple times from his body. Next, Shiemi's soul is lurking from her mouth, in a shocked fainted state. Yukio has furiously beat Rin unconscious by slippers, his tail out in the open. Rin was actually playing a prank on Shiemi using his tail inside his shirt but Yukio berates that the joke is too upsetting. (Source: Ao no Exorcist Wiki)