Koyuki's refusal to play along is what makes every delusion land, he's the brick wall that turns Kabuto's bit into actual comedy instead of just noise. The show knows the joke isn't that Kabuto is crazy; it's that Koyuki can't escape him no matter how hard he resists, and watching him slowly stop trying is the whole thing. By episode six you're not laughing at the punchlines anymore, you're laughing because these two have already won against each other.
Seri Koyuki wants nothing more than an ordinary high school experience. That plan crumbles the moment Kabuto Hanadori sits next to him in class. Kabuto lives entirely in his own delusional world, constantly spinning elaborate fantasies about being a valiant knight, a supernatural warrior with a sealed dark power, or whatever ridiculous persona strikes his imagination that day. He drags Seri into these delusions whether Seri likes it or not, forcing him into the role of reluctant sidekick and perpetual straight man to Kabuto's escalating absurdity. Seri swears he won't let Kabuto control him, but resisting proves nearly impossible. Every morning brings a new scheme, a new fantasy, a new crisis that only exists in Kabuto's mind. Yet somehow, despite the constant chaos and ridiculousness, the two begin forming an unlikely friendship. What starts as pure annoyance transforms into something stranger: genuine care wrapped in comedy. For anyone who enjoys watching deadpan characters react to unhinged energy, this show delivers comedy through sheer contrast and the escalating madness of two mismatched friends learning to coexist.