Lugal Gigam

A high school student named Amagi Souya is abruptly taken to a fantasy world populated by deities, magic, mythical creatures, and monsters. To locate the legendary "Star Gate" that could return him to his original world, Souya joins forces with three other individuals from different realities: a samurai from Japan's Warring Period, an NYPD officer accompanied by a guardian angel, and a Crusader with hidden pasts. Together, they navigate the ruined remains of the Capital City, an area shrouded in miasma. While Souya's main goal is to return home, his meeting with Raquell, a girl who claims to be his destined lover and identifies herself as a goddess, thrusts him into a series of unpredictable and perilous situations.