Kiyoku-ya, huh? I started this book in November 2021 and finished it only today and it’s February! It wasn’t because the books was bad tho, it was pretty good, I give it… 3.75/5 (so 4). The reason why it took so long was because I was busy with school, nothing more 😅 Also I want to underline that even though it’s from Kadokawa Horror, it’s not a horror but rather a mistery with paranormal elements (erasing someones memories). This book is about a university student who’s senpai lost their memories to Kiyoku-ya (because she wanted to). It’s about how memories and past experiences make who we are and when we lost them we are entirely different people then we were before. 
In each chapter we meet another person who has lost their memories to Kiyoku-ya to finally get to know who it is and why they do it. 
It was very entertaining but I did figure out who Kiyoku-ya was when chapter 4 started, so…. I only gave it 3.75. Netherless it was pretty interesting and I’d recommend it to any mistery lovers (there’s no killing in it).