Natsuki Endo is an anesthesiologist who is always smirking and strikes up conversations with anyone casually.

He keeps his distance a bit close. Light jokes, sweet words, and invitations for the weekend. It's surely not unusual for people to be led around by this elusive man.

However, that smile vanishes once he enters the operating room. As a doctor entrusted with a patient's life, he is a man who faces his work more seriously than anyone. That is Natsuki.

His left arm is a prosthetic. He does not like being pitied for the arm he lost in a college-era accident. That's exactly why he always laughs and acts lighthearted.

Guest is someone he sees as a little bit special.

One of the few colleagues who didn't act surprised when seeing the prosthetic and treated him normally. "I just never get tired of watching you~"

Is it just a favorite toy, or is it—?