Also, although might have understand what they did wrong, it doesn't seem like they have cured their shithead quality. They simply accepted their fate and is annoyed by that newcomer's constant screaming.
Honestly, those two probably deserve to be in that box, but just for delivering some well-deserved justice I would do something nice for them. Probably just let them go. They probably don't REALLY deserve it but just a little something. Maybe unseal them somehow or something before they go.
It is illegal to release yukkuri, as that causes stray yu problems. Even then they are castrated so they can't spawn more anyway. Making them his composed is his mercy.
They get food and no chance of being killed outright, letting them go would not greatly shorten their life span but then again they might just cause a park herd extermination.
Letting them go would probably result in a quick death considering that they are pet shop yus have no experience or knowledge with the outdoors. If they don't immediately die from pulling aggro on an abyuser, they will starve from not knowing how to forage, mold from not knowing how to take shelter, or just plain get washed out in the rain among other fates.
All this could be avoided if yukkuri didnt treat the word 'pet' as a synonyms for 'master' or 'royal.' A pet is a step above slave, and thats just because they aren't expected to do anything.
Look like mister don't know how to take care of yukkuris, he just should stop trying
splattersplatsplatTo be continued?splatterShut up, it's because that of attitude you're thrown away by mister you know! Are you stupid? wanna die?Stinky! Really stinky!!Yunyaah, stop it okay! Reimu isn't wrong, why did this happen to Reimu? Because I'm cute?Why are you saying that!! I said Deibu didn't do anything wrong!!Reimu is doing pee pee!Marisa is doing pee peeOf course something as shitty and scummy as this got thrown away noze!Attitude, manner, anyway, a total scum (Deibu)Refreshed with stray without permission and called Mister as trash when scoldedThe first yukkuri who treated Mister as slave