The Wandering Shinigami

Hikari, a normal guy who was isekai'd into the world of Bleach, finds his life taking an unexpected turn when he is recruited as a player by "Miracle." Emerging from the realm of Shinigamis, Hollows, and Quincies, Hikari embarks on a journey through various realms, relying on his knowledge of spiritual power to become the greatest Shinigami across all worlds.
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Well, that almost sounded like the introduction to a shonen novel. However, this is the story of an average-talented Shinigami (or is he?) striving to achieve ███████.