During AnimeJapan 2025, CyberAgent revealed a new trailer for the TV anime adaptation of The Summer Hikaru Died, confirming that TOOBOE performs the ending theme song “you are my monster. Three new cast members for the anime were also confirmed in the latest trailer for The Summer Hikaru Died.
The cast of The Summer Hikaru Died includes:






- Chiaki Kobayashi as Yoshiki Tsujinaka
- Shūichirō Umeda as Hikaru Indou
- Yumiri Hanamori as Asako Yamagishi
- Wakana Kowaka as Rie Kurebayashi
- Chikahiro Kobayashi as Tanaka
The Summer Hikaru Died is coming soon to Netflix, and it will be produced by Cygames Pictures and published by Kadokawa.

Ryohei Takeshita (Jellyfish Can’t Swim in the Night) is directing the new anime. Yuichi Takahashi is the character designer and chief animation director, and Masanobu Hiraoka is the DORODORO animator.
Lastly, here’s a story synopsis for the TV anime:
In a certain village
Since their childhood, they have grown up together.
Yoshiki and Hikaru, childhood friends.
the sun shining down on them
the chirping sound of a crypto tympana facialis
Ice cream on the way home
Laughing over trivial things
One day in summer, no different from any other day
…… You’re not Hikaru after all, are you?
Half a year ago, Hikaru went missing in the mountains.
A week later, he came back on a whim.
The voice, the figure, the thing that looked like Hikaru
What was stirring inside…
“Hikaru is no longer with us. …… if that’s the case.”
Starting the days with “something” in the form of a friend,
The “same as usual” everyday life.
But at the same time…
Strange incidents begin to plague the village.
Falling into the unknown “something”