Aikawa Subaro, recent moved to the island of Mikotojima, works as a clerk for the sole medical clinic there. The Director of the clinic, having taken a liking to Subaro, has been training him to give medical treatments. But as an unlicensed practitioner, what Subaro has been doing is illegal. But now that an emergency has come up and the sole doctor is gone, Subaro may have to prove his mettle sooner than expected.