Please help me to find this manga.

It's been a quite long time since I read this manga, but from what I remember, this is a detective manga with triplets (girl). On the first chapter, the triplets will kind of test him, and he able to tell the difference between each triplets, from the way they walk or put their shoes (?) etc.

Then there are also an arc where they go to a snowy village with female reporter (?), turns out the reporter used to live there and she tried to scare the perpetrator who hide the death of her family. I think the death of her family was caused by poisonous mushroom.

Sadly, that's the only thing that I remember from the manga 😢

Thank you in advance!

Um I don't think this is it, but there was a triplet arc in this detective story which starts ch 10. Also vaguely remember a poison mushroom but it was somewhere in the middle of the series so I can't pin point the ch...

Usotoki Rhetoric