Here is an overview of the game, via its official website:
In Fragment’s Note+ AfterStory, you can enjoy the story that follows the events of the previous title, Fragment’s Note+. The sequel contains a continuation for each of the main heroine’s routes: Mischa, Haya, and Eri. Join them to see what kind of future Yukiha’s choices will create!
Following the story of Fragment’s Note+…
With the power of Miu, a girl claiming to be his daughter from the future, protagonist Yukiha manages to secure a better fate for himself.
“It’s gonna be a new future from here!”
Taking Miu’s words to heart, Yukiha and his chosen partner set off on their new path together.
However, it seems that journey won’t be as smooth as they thought…
The original Fragment’s Note+ launched for Switch via Nintendo eShop on July 21 in Japan and October 13 worldwide.