“Comfy”? My go-to answer would be Aria (the Animation, the Natural, the Origination), but lately, that has been matched by Natsume Yuujinchou as my go-to when I just want to relax. There’s also “Tanaka-kun is Always Listless” but it has enough humor that breaks the “relaxing” mood. Bakaramon might be a better match, but it isn’t really fitting the bill.

Thus, my answer would be these two:

• Aria (the Animation, the Natural, the Origination)
• Natsume Yuujinchou