you did save and character before deleting the game, then in order for them to be in the new game, they had to be copied there.
If you made a save and character in the new game, then make sure that you did not make a mistake.
Saving the game is done only at home and the save file must contain the date and time of the save. If you simply click on save and do not wait for the save record to appear, then consider that you have not saved anything.
I wrote about saving characters earlier
#3,240
This topic has a Steam version koikatsu party + repak for Steam version (without main game).
Repack can not be bad. It is tested and works stably