The film is at its best when threading unusual vignettes through various Tokyo landscapes, such as when we follow an unstoppable multicolored guitarist, or when a slightly ridiculous cosplayer suddenly jumps from a rooftop, inexplicably surviving only to flee on his moped just as white as his costume.
These scenes, though fun enough and appropriately tied in with the main plot, just don't mesh sufficiently well. Two films seem to be fighting for the right to exist here, a limp absurdist comedy and a hastily spliced family drama.
The patchwork approach is viable, but the absurd intensity should have been pushed far beyond what is presented, and the dialogue crafted with greater flair.
The interludes with the dead wife's colleagues are entirely dispensable.

That said, nothing is mediocre, the actors play well, Tokyo is beautiful, and the group scenes in the final act are touching.