A Japanese senior high school student who otherwise leads a generic and unassuming life, but strives to act in his own interests no matter what, and has the plot armour to reasonably do so. He's really only here because that very same pink gremlin mentioned above pilfered his wallet - and if you didn't know, students these days are strapped for cash.

Kai is in his late teens / very early adult years. He's arrogant, albeit low-key and not in-your-face about that particular attribute. He's very competitive and hot-headed, though, and when it matters, he can get passionate with his reactions - both on the positive and negative side. He recognizes that his power as the main character is not to be squandered, and cherishes it deeply. When it fails him, he's utterly distraught.

Required for this role are some vocal-sensitive responses such as wails, yelps, and groans of pain and exhaustion.