It has been announced that YOASOBI's new song "UNDEAD" (release date yet to be determined) will be the theme song for the anime "Monogatari Series Off & Monster Season," and a promotional video featuring part of the song, titled "Orokamononogatari & Nademonogatari PV " was released on the 3rd.

The "Monogatari Series" is an anime adaptation of novels by Nisio Isin, produced by Shaft. Starting with "Bakemonogatari" aired in 2009, numerous series have been adapted into anime. The upcoming "Off & Monster Season" is scheduled for release in 2024, and it has been decided that it will be streamed weekly on ABEMA starting July 6th, every Saturday.

Composer Ayase of YOASOBI, who wrote the theme song "UNDEAD," said, "I have always had a special place in my heart for the 'Monogatari Series,' and it is one of my favorite anime series that I mention whenever asked. I was truly overjoyed and elated when it was decided that I would be handling the music for its latest work. I put all my heart and soul into creating this song, packing it with love for the series and each character that appears in it. I hope everyone will enjoy it."

Vocalist Ikura added, "I am truly honored to be involved musically in the latest installment of the 'Monogatari Series,' a work that has been loved by many for a long time. I sang each character's feelings thoughtfully while interpreting them deeply. I would be happy if you enjoy listening to it."