Campione! Matsurowanu Kamigami to Kamigoroshi no Maou

Synopsis

In the Purgatory, Godou meets Susanoo in a cabin, revealing himself as a god who is also Ena's guardian, and Godou begins to understand who Susanoo was before he retired to the Purgatory. Meanwhile, as they resume their intense fight in the mountains, Ena allows her sword to fully possess and control by her, which is gradually depleting Erica's energy. Liliana and Yuri witness a black aura filling the sky, covering the entire world. When Godou takes over the fight against Ena, she decides to retreat instead. As Erica is slowly dying, Godou tries to teleport her back on Earth, but ends up taking her to various places. At the Kusanagi household, Shizuka misunderstands the things Athena said about her relationship with Godou before suddenly leaving. On an island, as Erica says her last words, Godou finally masters summoning the Youth from Verethragna's spirit, having her ingest it through him to save her life and give her divine protection. While trying to rescue Godou and Erica, Liliana and Yuri are interrupted by the same scythe-wielding serpent goddess that consumed Perseus. At the shrine, when Ena reappears completely merged with her in the form of a god, Godou and Erica save her, but the serpent goddess, recognized as Metis, absorbs the power of Ena's sword.

(Source: Wikipedia)