Parallel Paradise GN Vol 18 (MR)
All along, Yota has believed that his childhood friend Nishina is the Jealous God who put all of humanity under a lethal curse. Now he knows she's been playing him all along and that the truth is far worse. The Jealous God is Kanejo, Yota's old kendo rival, known for his cruelty, his arrogance, and for being unbeatable.