Merman in My Tub, Volume 1: 06/11/17
Merman in My Tub, Volume 1 (オレん家のフロ事情 1) by Itokichi is the English language translation of the manga that inspired the anime of the same name (Orenchi no furo jijo).
A more direct translation of the title would be something like "Company in the bathroom" which is frankly a better title given how many different guests end up in that tub at one time or another. Some of the other guests include an octopus, a jellyfish, and an electric eel.
But the main resident of the tub is a merman named Wakasa, rescued by a young man named Tatsumi. This manga is a series of four panel comics that in tone remind me of Garfield, with Wakasa being the cat and Tatsumi being Jon.
In both set-ups, the host (or owner, in Jon's case) is living on a limited and unpredictable incomes. Tatsumi's problem is that he's a high school student living by himself and Tokyo, like any large city, is expensive to live in.
I have five more volumes to read. I doubt I'll be reviewing more issues, given how episodic these things are. But they're cute and sassy.