A cohesive list of all Japanese short films I can find on the Letterboxd database, arranged from Release Order Oldest -> Newest.

A short film on this account is classed as 44 minutes or under. Some will be anime OVAs, some will be "full length films" that are under 45 minutes, I've included all of them down to the fact that setting basics can get confusing and some will "break rules" but still be valid, so in fairness, everything is counted.
Entries must be Japanese (eg: American & Chinese Pokémon shorts do not count).