On August 17, 2022, it was announced that Mrs. Green Apple would be performing the theme song for Fragments of the Last Will, directed by Takahisa Zeze, to be released on December 9.

[5][6] Ohmori appeared at the stage greeting of Fragments of the Last Will alongside the film's cast members at Toho Cinema in Tokyo Midtown Hibiya and performed "Soranji" while playing the guitar.

[7] "Soranji" is a personal and introspective ballad that uses simple words to convey the message of a desire to live against a background of strings.

[13] Ohmori stated that he "wanted a hook that clearly showed who provided the music", and that the song was about the feelings of Uta but also "who we were at the time".

[14] The song was recorded without any rehearsals, with Ohmori saying that they "wanted to enjoy the feeling of reaching a slightly unexpected place, or having some kind of chemical reaction.