Had this manga on watch for quite some time, held back till it's finished because I had a LOT missed out stories in the bucket list.
Revenge killing a sexual predator that intentionally hired himself in job with easy access to groom and abuse, that trash knew what it was doing. Most likely it wasn't his only target of abuse, he had a daughter, who knows if she wasn't abused either.
Taking life of someone is not easy, but that wasn't a normal life, that was a "an object" who fed on defenceless and weak before they could become something greater. Guilt for getting rid of it is not reasonable, he did world a favour.
Disposing off the parasite unfortunately got him 7 years sentence, but for planned murder isn't that high, still should get a pardon earlier. But that's Japan.
Shiika visiting Yuri grave instead of her father is a dead giveaway she doesn't despise Kazuma, instead mourn her piece of shit father's victim, perhaps asking for forgiveness.
Not sure she would forgive Kazuma, but having such parasite as a family member, wouldn't really make me vangeful if someone got rid of it, although seeing a brutal murder right in front of her must have been traumatising.
Thanks for scanlation!