After transmigrating to a crossover world, Hoshino Yu, who grew up in an orphanage without parents from the start, finally gets the System every transmigrator is supposed to have. The good news: this System has some real perks. The bad news: this world is a little different.
Hoshino Ai, who grew up alongside him at the orphanage and is the same age as him, yet thinks of herself as his big sister. The Yagami family, Koushiro, and Tachikawa Mimi, whom he met during the Hikarigaoka mass hallucination incident... And the conglomerates Shijo, Shijo, Suzuki, and Iwanaga, whose names seem oddly familiar. His impossibly unlucky online gaming buddy, who always claims to be the legendary Princess Kaguya. His classmate Yotsuya Miko, who seems a little neurotic. Hanazono Yurine, whom he met at an exorcist exchange meeting. His classmate, the angel Gabriel, whom he hasn't seen in a week. The Kobayashi next door has a dragon named Tohru. Local gods, yokai, heroic spirits... Parasites, impostors, and symbiotes from outer space... Dad (the world), you're not dead yet?