Betrayed by My Girlfriend, I Unexpectedly Gained X-Ray Vision

Overpowered Stories with Multiple Female Leads, but Not Too Harem-Like, No Miserable Plotlines, and a Slice-of-Life Focus

I want something like Detective Conan: When Toji Fushiguro Transmigrates into the World of Detective Stories. It can be fanfiction, a crossover, or any genre, but don’t force romance just for the sake of it. Ideally, the romantic development should be gradual and logical. No walking incubus, please. Fellow readers, your recommendations are welcome.