I set up a page listing some Excess Stuff that I'd like to sell...
https://12bit.club/shop/
Currently I've got a bunch of newish recentish emulation consoles and famiclones up there. It's all pretty cheap! Check it out if you're interested in that kind of thing!
Also when searching about this game I found out there is another notable Mamoru-kun who is a disaster preparedness mascot created by CyberConnect2 for Fukuoka prefecture.... He is also very good
Somehow I am top of the Arcade mode character rankings for Mamoru.... This obviously means more people need to play it and beat me
(Are these leaderboards platform specific? Region specific? I guess they are the latter since I don't see any JP names)
The shop I bought the bunny bookmark from had a whole load of different ones & they're all really cool. They're made by Ark Colour Design if you want to look them up