Some trademarks have been filed in Japan by diverse companies.
First, Marvelous trademarked “Gran Dark” and “Giga Strikers“, while Level-5 trademarked “Star System“.
Finally, Byking (developer of My Hero One’s Justice, Gunslinger Stratos) also filed trademarks for “Fantasy Days” (“Kuusou Days” in japanese).
None of these trademarks correspond to previously announced games.
Via | Gematsu