This is a game played by the gods.
This is an anomaly the gods have placed in the world of Katekyo Hitman Reborn.
Please note:
☆ The story is set against the larger backdrop of The Gods' Game (see the author's The Gods' Game for details).
☆ Other characters start out with slightly higher favorability toward the protagonist. (For example, the protagonist might seem a little more likable than an ordinary stranger.)
☆ The protagonist transmigrates into a Katekyo Hitman Reborn fanfic, not the original series.
☆ That fanfic is also original. Its setting will probably be included in The Gods' Game. Knowing it will make the characters feel more fully realized (? ).
☆ The Anomaly arc in The Gods' Game is a prequel (?), a kind of extra story. It will contain spoilers, which I'll mark in the title. I'll also suggest when it might be best to read it.
☆ The protagonist is the seme, and his partner is Hibari Kyoya.
