The story is set in a fantasy world where magic is used along with traditional medicine. The protagonist of the story, Shion, was forced to move in with a young family who are researching and treating magic. As a result of the incident, he suddenly develops magical abilities. However, Shion cannot control them and the healer Rui takes him under her care. To fully master the control of magic at such an "old" age for magic, the protagonist must mature sexually as well. So Rui decides to help him with this, even though she is a married woman.
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