I have to say, I remmber there being theories that it was Wilk, and not Sofia, that killed his family and it seems they were correct! Of course assuming that Tsurumi is telling the truth - which is like an impossible thing to know. I have never seen a character like him, not only he plays mind games with everyone in this manga but also with us, the readers.
I have to give kudos to Ogata for being able to see though his deception, he may not be able to understand love but he can spot a lying B.
Also I think it's funny how Tsukishima, of all of Tsurumi's harem, seems to be the most easy to deceive. I look forward to the day that he and Koito together will dispose of Tsurumi 🤡