In the anime, Michio Kaga enters a game-like world where he uses "cheat" powers to gain strength and build a harem. As Roxanne is the first person to join his party and his first romantic partner, the choice of her voice actress to sing the opening theme underscores her central importance to his journey. Unlike many light-hearted isekai themes, "Oath" carries a tone of serious resolve, reflecting the "slow and calculating" nature of the story's dungeon exploration and the high stakes of survival.
The full version of the song, released on July 27, 2022, expands on the driving beat of the TV edit, emphasizing the protagonist's journey from a despondent high school student to a powerful adventurer in a new world. Lyric Analysis: Themes of Devotion Isekai Meikyuu de Harem wo Opening Full Oath Shiori Mikami
The lyrics of "Oath" serve as a thematic bridge between the protagonist, Michio Kaga, and his companions. Key lyrical motifs include: In the anime, Michio Kaga enters a game-like
The "oath" mentioned in the title refers to a commitment to fight and survive within the dangerous Labyrinth, moving forward despite past shadows. Context within the Series The full version of the song, released on
The opening theme of the anime Isekai Meikyuu de Harem wo (Harem in the Labyrinth of Another World), titled is performed by Shiori Mikami , who also voices the lead female character, Roxanne . This energetic track sets the stage for a series that blends traditional RPG dungeon crawling with mature harem elements. Musical Composition and Artist
Lines such as "I'll never forget the tears shed in your eyes" and "Devoting itself completely to you" mirror the deep bond between Michio and Roxanne.
The song reflects Michio's transition from a world he found "hard to live in" to a fantasy reality where he has a second chance.