After a long and bloody war between the nagas and people, the snake people won, which the aristocrat and veteran of this war, Duke Ison Karlas, cannot come to terms with. Things become more complicated when he learns that, as a guarantee of a truce, the Naga king plans to forcibly marry the last surviving heir of the defeated king. The Duke saw Princess Melissa only once, but this was already enough to promise himself to prevent this wedding and save the princess from the usurper, because the man has no doubt that Melissa was destined for him by Fate itself.