Random recommendation:
軽い気持ちで『異世界産の商品』を売ってみたら結構な騒ぎになった……. A random high-schooler gets summoned as one of the heroes, but his only blessing is Otherworldly Merchant (buying things from Earth, but doesn't sell well there). Tries fighting for half a year but fails and starts a career as a merchant with moderate success instead. After 10 years he gets sent back to Earth, except the wrong one. This one is a modern-day dungeon world and he can still use the blessing, though now by buying/selling isekai items he gets a great advantage.
Pretty laid-back series with lots of funny interactions and a slight amount of fighting (ignoring poor slimes getting massacred behind the scenes).
FAQ:
- MC OP?: Not from the start, but can do lots of things locals can't.
- Harem?: Yes, currently ~7 girls
- Snu-Snu?: Yes, though pretty late in the series. Has some interesting scenes from the beginning though.
Random note: Winning heroine (not the main one, just the one that always wins
) is a 30+ scary career-woman onee-san.