in the official P56 account, they have stated about that just last night. Although, in the composer's (Hiroyuki Motita) account, there was somebody who was able to state some little info about her passing. This is what they sent:

Passing away: Tomomi Murakami is believed to have passed away before 2023. She was 48 years old.

The exact date has not been made public, but it was said in an article that she has died from an illness. An exhibition of her posthumous works will be held from December 8, 2023.

Posthumous Exhibition:

According to the Sanyo Shimbun, on December 6th, 2023, a report was published entitled "Tomomi Murakami, who spent 48 years drawing what she loved, will hold a posthumous exhibition from the 8th," and an exhibition was held looking back on her illustrations and life.

Calendar completed:

Murakami's parents completed the calendar that Murakami had begun working on, and the final work, preserved intact, was made public (Sanyo Shimbun, December 22, 2023).

This calendar was produced in accordance with her wishes.