is a song performed by Japanese singer Yōko Takahashi. Toshiyuki Ōmori composed and arranged the song, while Neko Oikawa wrote the lyrics. King Records released it as a single on February 21, 1997, and the production team used it during the closing sequence of the animated film Neon Genesis Evangelion: Death and Rebirth (1997). Oikawa based the lyrics on the Neon Genesis Evangelion episode "Rei III", connecting Rei Ayanami's death and subsequent return through another clone with the concept of reincarnation.
"Soul's Refrain" reached number three on the Oricon Singles Chart and became one of the best-known songs associated with the Evangelion franchise. Critics praised its melody, Oikawa's lyrics, and the way its music and themes complement the world of the series. The song later appeared in Evangelion-themed pachinko machines and received numerous cover versions.
Background and recording Japanese singer Yōko Takahashi performed "A Cruel Angel's Thesis", the opening theme of the Neon Genesis Evangelion television series, recording it before she knew the series' story or other details about the production. After the television series ended and plans for a theatrical film emerged, Takahashi was asked to perform its theme song, "Soul's Refrain". The production team initially planned the film Neon Genesis Evangelion: Death and Rebirth (1997) to conclude the series, with the segment Rebirth presenting an entirely new final story. As the project expanded, they postponed the conclusion to a later film, The End of Evangelion (1997), and ended Rebirth at the beginning of the confrontation between Asuka Langley Soryu's Eva-02 and the Eva Series, followed by "Soul's Refrain" over the closing sequence. The completed version of the segment, titled "Air" in The End of Evangelion, extends the story beyond Rebirth'''s former endpoint, so the film omits "Soul's Refrain" from the sequence. The production team considered two songs for the film's theme, "Soul's Refrain" and "Kokoro yo Genshi ni Modore". Toshiyuki Ōmori composed "Soul's Refrain", while Hidetoshi Satō composed "Kokoro yo Genshi ni Modore", with Ōmori arranging both tracks. Ōmori approached both songs with the same commitment, stating that he intended to make each one the best it could be regardless of which one would ultimately be selected. Ōmori had previously arranged "A Cruel Angel's Thesis", which also featured lyrics by Neko Oikawa.
Yōko Takahashi became involved with Neon Genesis Evangelion after returning from six months of musical study in Los Angeles. She had known composer and arranger Toshiyuki Ōmori since before her professional debut and regarded him as a longtime mentor. Through Ōmori and his connections, she was approached to participate in a project featuring different singers performing the anime's ending theme, "Fly Me to the Moon". After her record label approved the collaboration, producer Toshimichi Ōtsuki invited her to sing the series' opening theme as well. Takahashi then recorded "Soul's Refrain" on January 12, 1997. Staff received the lyrics by fax at the recording studio and copied them by hand onto the sheet music before Takahashi recorded the vocals. Takahashi herself commented: "The recording took place while everyone was striving to make the best work possible. Including 'Kokoro yo Genshi ni Modore', which we recorded at the same time, I sang even more professionally than before so that either song could be chosen as the theme song". She learned which song the production had selected, and where it appeared, only after watching the film in a theater. Takahashi described "Soul's Refrain" as "overwhelmingly easier to sing" than "A Cruel Angel's Thesis". She attributed this to its greater dynamic variation and the placement of breathing points where she naturally feels the need to breathe. Kazuya Tsurumaki, assistant director of the original series and director of Rebirth, later suggested that chief director Hideaki Anno select "Soul's Refrain" rather than "Kokoro yo Genshi ni Modore".
Composition and lyrics Neko Oikawa wrote the lyrics for "Soul's Refrain". At the time, she still had little familiarity with Evangelion. When writing "A Cruel Angel's Thesis", she had skimmed an Evangelion project proposal document and briefly watched two unfinished episodes before writing the song. For the two prospective film themes, producer Toshimichi Ōtsuki similarly gave Oikawa just a videotape containing a single episode, "Rei III", in which Rei Ayanami dies and another clone takes her place, along with demos of the two prospective theme songs, "Soul's Refrain" and "Kokoro yo Genshi ni Modore". The production team had yet to choose which song would serve as the theme. Ōtsuki simply instructed Oikawa to write whatever came to mind after watching the episode. Upon hearing the opening notes of the "Soul's Refrain" demo, Oikawa immediately conceived the phrase to match the melody. She associated Rei's death and replacement with the concept of reincarnation. "Kokoro yo Genshi ni Modore" also centers on the idea of life awaiting the moment of its awakening. Oikawa wrote its lyrics alongside "Soul's Refrain" after watching the same footage, resulting in similar themes between the two songs.
Oikawa initially conceived the phrase , but its syllable count did not fit the melody, and she disliked the truncated sound of . She therefore replaced with the French-derived pronunciation , resulting in the title . Oikawa also linked the opening phrase "return to me" to the image of . Takahashi identified three elements as characteristic of the musical style associated with her long-standing collaboration with Ōmori: an opening led by the chorus, a dynamic minor-key melody, and solemn choral vocals. Takahashi also recalled that the word carried religious and somewhat mysterious connotations at the time, giving the title a particular impact. The lyrics for "Soul's Refrain" remained unfinished until the recording day itself. UtaTen classified "Soul's Refrain" as a J-pop song, while LisAni! noted its fast tempo. Animate Times observed that "Soul's Refrain" expresses themes of motherhood, which Oikawa and Ōmori later revisited in , a theme song for an Evangelion pachislot game. Jin Sugiyama of Real Sound described the song as "a fusion of an almost divine atmosphere and elements of club music of the time". The website Gyafun Kōbō similarly noted that the lyrics raise questions about human origins and the purpose of human existence. Despite the song's fast rhythm, the reviewer found that its lyrical world evokes a "strange sense of reassurance", alongside an anxiety over whether one should surrender to it, creating an "ambivalent" feeling.
Release King Records released the original "Soul's Refrain" single on 8-cm CD on February 21, 1997, pairing the title track with "Kokoro yo Genshi ni Modore" as its B-side. The single also included an instrumental version of "Soul's Refrain" titled "Off Vocal Version". First-edition copies came with an original Cardass Masters trading card from Japanese toy and entertainment company Bandai's Cardass collectible card line. On May 24, 2006, King Records issued a new CD single pairing "Soul's Refrain" with Loren and Mash's "Thanatos: If I Can't Be Yours"; the release also included "Kokoro yo Genshi ni Modore", a new mix of "Thanatos", and the "Off Vocal Version" of "Soul's Refrain". On June 20, 2018, the label released a remastered version of the title track on a double A-side single with "A Cruel Angel's Thesis". The release featured remastered versions of both songs sourced from their original analog tapes, and included instrumental versions of each track. The song also appeared on albums collecting music from the series, beginning with Geneon Entertainment's The Day of Second Impact, released to mark the date of the eponymous fictional catastrophe in the series' chronology. Refrain of Evangelion followed on July 24, 2003, and Neon Genesis Evangelion: Decade on October 26, 2005. On December 21, 2007, King Records issued a remastered version of the track on A.T. EVA01 Reference CD.
On October 7, 2020, the song appeared on the Evangelion Death disc included in Neon Genesis Evangelion Soundtrack 25th Anniversary Box and on the album Evangelion Finally. Five years later, Evangelion Flashback, released on October 29, 2025, also included "Soul's Refrain" for the series' 30th anniversary. On February 21, 2026, King Records issued a "Soul's Refrain" Evangelion 30th Anniversary Edition LP in both a limited-edition colored-vinyl pressing and a standard edition. In 2026, Apple Music also released a Dolby Atmos spatial-audio mix of "Soul's Refrain" alongside a corresponding mix of "A Cruel Angel's Thesis", following a proposal from Takahashi herself. Takahashi attended the Dolby Atmos mixing sessions and monitored the mixes throughout the process. For "Soul's Refrain", whose arrangement is centered on the bass, she felt that the initial mix placed too much sound in the upper part of the sound field, making the bass differ from the familiar impression of the original. She therefore requested adjustments that retained the original sound while preserving the characteristics of spatial audio. After repeated checks, the final mix preserved the sound familiar to listeners while adding greater presence to the lower part of the sound field. "Soul's Refrain" also appeared in pachinko machines based on Evangelion, including and .
Critical receptionChō! Animedia called "Soul's Refrain" "one of the representative songs of the Evangelion series" and described its melody as "catchy". Writer Tamotsu Narita of Da Vinci praised Neko Oikawa's ability to match the natural intonation of spoken words to a song's melody, citing "Soul's Refrain" as an example. Ciatr described "Soul's Refrain" as having an "impactful" sound and as one of the best-known songs from the Evangelion series. The same website also praised the song's "cool" melody and called the chorus phrase "catchy". Kyoto University of Foreign Studies scholar Masatomi Furuhata referred to "Soul's Refrain" as a song "deeply engraved in our hearts", while Meiji University professor Toru Kato called "Soul's Refrain" a "classic anime song". Magmix praised "Soul's Refrain" as a great song whose lyrics and musical style match the world of Neon Genesis Evangelion. Singer Yui Sakakibara said she had long liked the impassioned way in which "Soul's Refrain" is sung. While recording her own cover, she was particularly struck by the difficulty of building the song's intensity further at the final words "Soul's Refrain", which made her appreciate anew the song's greatness and high level of technique. The BayFM music program 9 no Otoiki described "Soul's Refrain" as a "great song of grand scale" that invites repeated listening.
Commercial performance