Sougo's basically obsessed with collecting rare crystals—something he picked up from his mom Ena—and he's convinced there's this legendary red gem called Lucifer that he wants to prove actually exists. His mom had a theory about it, and he's determined to prove her right. Problem is, he tends to rush headfirst into situations without thinking them through.
He stumbles across Felia in a cave, and that pretty much kicks off a whole chain of adventures with her, Kaon, Roman, and Otto. The group ends up going through a lot together.
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