That's...good...? The death seemed painful, impactful and a good close to this arc, but the chapters from this arc have felt really incomplete, like every chapter is cut in half. Hopefully the pacing gets back to normal. Also Kisaki accepted him being a time leaper WAY too easily for him not to have something similar up his sleeve.
inb4 this becomes an isekai manga with Kisaki ending up in a fantasy world and beating the demon king so he can get back to Tokyo and become the king of all deliquents