According to Gematsu, Square Enix has announced that the Switch version of I Am Setsuna will include free DLC called Temporal Battle Arena, that will launch in April.
Players who download the DLC will have access to the Temporal Battle Arena by progressing through the story and then talking to an NPC character appearing in a specific map.
Temporal Battle Arena will let players upload their own battle data for others to download, but there is a maximum of three of these battle datas. This lets players to fight against other player's parties, controlled by the game's AI.
The Switch version of I Am Setsuna launched on Nintendo's eShop today. The game is also out for PC, PS4, and Xbox One since last year, but the new DLC will be exclusively available on Switch.