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Twelve year old Sei has hit puberty and is quickly becoming sexually aware, sometimes not as privately as he'd like; erections in school and other inopportune times plague him. He talks about it with his school friends, Kinta and Nyanko, in between their feuding over the affections of classmate Yumi, but can't figure out what to do about it.

• 
  Shin Togashi

• 
  Masahiro Hisano
  Sei
• 
  Yukika Sakuratani
  Nao
• 
  Jun Kunimura
  Sei's Father
• 
  Takuya Kurihara
  Nyanko
• 
  Michiko Kawai
  Sei's Mother
• 
  Ayumu Saito
  Nao's Father
• 
  Shoichi Sato
  Kinta