The original novel 'Hotarubi no Mori e' by Yuki Midorikawa, on which the movie is based, was first published, introducing the story that inspired the film adaptation.
The anime film adaptation of 'Hotarubi no Mori e' was released, bringing the story to a wider audience and contributing to its popularity.
Hikari encounters Hotaru in the forest of fireflies for the first time.
Hikari and Hotaru attend the annual firefly festival together, strengthening their bond.
Hikari discovers that Hotaru is a spirit connected to the fireflies.
Hikari and Hotaru make a heartfelt promise to meet in the forest every year during firefly season.
Hikari patiently waits in the forest, anticipating Hotaru's arrival as promised.
