Sword Art Online 12 (light novel): Alicization Rising

READ THE NOVEL THAT IGNITED THE PHENOMENON! After a brief respite, Kirito and Eugeo set off again to climb Central Cathedral-but the powerful Integrity Knights are not about to let them reach the top. Meanwhile, Kirito has learned the dark history of the Underworld and the true stakes of the battle they're fighting, and every step toward Alice brings him closer to an impossible decision...