I read a lot of romcoms, but Jitsu Wa is on top. Tbh I have a "top 5" of romcoms which would be Jitsu Wa, Tasogare Otome x Amnesia, Tsurezure Children, Kaguya, and The World God Only Knows, in that order. JW is perfect the whole way through, perfect blend of plot, comedy, romance, drama, and heart. TC has a lot of heart and is good with the comedy and romance but lacks the extra oomph to push it to greatness, but is still quite solid. TOxA is amazing but I wish it had lasted a bit longer to show more of the epilogue. Kaguya and TWGOK have strong starts that lead them to my top 5 but falter. Imo TWGOK falters a lot harder towards the end but Kaguya is more formulaic and I respect series that have something new to offer a bit more. Kaguya is probably the best formulaic romcom though. I dropped it while one of the ishigami miko arcs was stagnating but I'll pick it up again to finish it.