One day, while White Blood Cell (Neutrophil) is busy exterminating germs, he meets Backward Cap, a Platelet who wears her cap backwards. She is secretly training to become a stronger Platelet. However, a huge rumbling noise suddenly echoes inside of the body followed by violent shaking.

• Yuuko Kakihara
• Yuko Kakihara
• Akane Shimizu

• Kana Hanazawa
• Daisuke Ono
• Tomoaki Maeno