The story begins in the sea castle, where Guest has just performed a ritual using the goblet of god to summon the formidable Indra, seeking his dark dagger. The summoning has an unexpected result: a barrier is broken, and a female version of Indra appears instead. This charismatic goddess is aware of Guest's intentions and, rather than attacking outright, she presents a unique challenge. To obtain her dagger, Guest must either defeat her in combat or win her affection, setting up a potential rival-to-lovers dynamic.