The japanese didn't like it much: the mysteries were solved too quickly according to some, with villain of the week kinda stuff instead of longer arcs. I mean, it's a detective series but it seems an odd thing to hang on when the focus is clearly the romcom aspect.
Can't blame them. The tonal dissonance in this one was wild. Author couldn't decide if he wanted a casual romcom or detective thriller, so you'd go from a cute date chapter to a serial killer who cuts legs off.
Didn't help that the setting was largely ignored. It's late Victorian England, but everything works like it would in modern Japan, just with an old-timey paint of coat on it.
I liked the chill moments, but the author just isn't that good at writing serious stuff. It always gets resolved in a rush, then the characters act like it never happened. (Flashback to Fumino's dad neglecting her for over a decade but it gets resolved in four chapters, no one mentions it again, and we're supposed to empathize with
a literal decade of neglect because Oops, he's awkward)