At first, Jinta thinks that he is merely hallucinating due to the summer heat, but he is later on convinced that what he sees truly is the ghost of Menma.
In other words, the event happens on the summer a decade after that summer that Menma returned.
They will be revealing more details about the project during a special event on August 28, 2021.
One hot summer day, his childhood friend, Meiko “Menma” Honma, appears and pesters him to grant a forgotten wish.