In 2015, Takahashi recorded a new version of the composition named "2015 Version" in a single live session with acoustic guitar accompaniment for her thirteenth studio album 20th century Boys & Girls II, which was released on April 22, 2015, by King Records. Two years later, a new arrangement titled "2017 Version" was included in the anthology Yoko Sings Forever (March 22, 2017); the recording was done live with piano by Marashii and organ by Satoshi Takebe. At first, a single titled "Zankoku na tenshi no these ~ Tamashii no rufuran" was planned but not included in the final version. In July 2019, "Zankoku na tenshi no these" was also used in the strategy video game The Battle Cats; Takahashi sang only the word , a Japanese onomatopoeia of meow. The version was later uploaded to Oricon and MaiDiGiTV YouTube channels, and both videos gained more than one million views. In the same year, Eitetsu Hayashi produced a new arrangement of "The Cruel Angel's Thesis" stylistically close to Japanese traditional music and mainly made with taiko instruments; it was premiered on King Amusement Creative's official YouTube channel as "Zankoku na tenshi no these: Matsuri Spirit" and was fully released on July 24 of the same year.
