The Anime Lad
Haruyoshi Kuga is an unrivaled exorcist who concludes that strength alone has not made him happy. A secret reincarnation technique gives him another life in a fantasy world. His exorcist methods accompany him into a setting with different magic. Happiness will now be pursued through caution, calculation, and considerable supernatural leverage.
Gigguku
A powerful exorcist begins again in a fantasy world where nobody shares his supernatural rulebook. That mismatch is SO satisfying. Local magic says one thing, his techniques say another, and every comparison starts crooked. Better yet, he treats happiness like a problem that planning can solve, which is clever and deeply concerning!
Father's Basement
The promise of overwhelming power in another world arrives prepackaged, and the advantage is hardly subtle. The useful wrinkle is cultural rather than numerical. Exorcist techniques enter a setting governed by different magic, so the comparison cannot stay on one scale. The calculated pursuit of happiness also gives the peaceful-life premise an uneasy edge.