Inspired by OneyPlays' Gameboy Advance SP Blue Edition creepypasta and by Delak's gmod animation of said creepypasta
They also use sounds from The Battle Cats, such as the sound that plays when you pay for the cat capsules as well as when the cat capsules are being opened when summoning characters or using certain items like gacha stars, and the sound that plays before entering a stage! And I'm saying this with knowledge that Anime Adventure literally gets away with stealing character ips from various anime.