@Oh baby baby baby I dunno if Isekai Mofumofu Cafe counts. Yes, there's fantasy fluffy and cute bunnies and cats, but Fenrir and Cerberus also do S-monster level fighting. Only one I've seen Cereberus in, though.
The Galactic Navy Officer Becomes an Adventurer
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM