So, other than that, how is it?
Well, there are roughly three jokes:
Tatsu does something normal, but his affect makes people think he's up to criminal mischief.
Tatsu does something normal, but with a ridiculous intensity.
Gangsters are baffled by Tatsu's domestic skills.
Tatsu, The Immortal Dragon, is a legendary Yakuza who beat up ten rival gangs with his bare hands in one night. Then, he disappeared.
Now he's a househusband.
For the opening episode, a series of small vignettes.