Fun thing: apparently Miyubi solved the P-NP-problem, one of the big currently unsolved mathematical problems, which would entitle her to a million dollar in prize money. But I guess she would be too lazy to collect it.
Glad the only case of animals living a short lifespan are the mice. Lanka would be long dead and her sister and her father if they lived their actual lifespan since their lifespan is 6 to 8 years. That chapter hurt to much when I read it.
Rolled up newspaper sounds like something Jin would use as a threat. Now he just needs to invest in some treats to work on that jumping and licking.
I think this is the first chapter to point out human intelligence. If the animals were as smart, it would mean Jin and Hitomi are just two exceptionally weak students.