Gravitation

Gravitation is the first opening theme of the third season of the Toaru Majutsu no Index anime adaptation. It was first used in episode 1 of the anime.

It is the first opening theme for the Toaru series performed by Kurosaki Maon after Kawada Mami's retirement.

Tracklist
Kawada Mami, despite being in retirement, provided lyrics, while music was composed by Nakazawa Tomoyuki. The proper single release of the song was on November 21, 2018.

The single release features the full version of the opening theme. Furthermore, the Limited First Edition CD and DVD versions include the music video and "making of" music video of the single. Finally, the Limited First Edition Anime CD and DVD versions include the short version of the music video and the creditless version of the Toaru Majutsu no Index III opening.
 * 1) Gravitation – 4:26
 * 2) Hazy Moon – 4:51
 * 3) Gravitation (instrumental) – 4:25
 * 4) Hazy Moon (instrumental) – 4:50

Characters
By order of appearance:
 * Index Librorum Prohibitorum
 * Fukiyose Seiri
 * Himegami Aisa
 * Tsukuyomi Komoe
 * Tsuchimikado Motoharu
 * Aogami Pierce
 * Stiyl Magnus
 * Kanzaki Kaori
 * Misaka Mikoto
 * Shirai Kuroko
 * Uiharu Kazari
 * Kamijou Touma
 * Sphynx
 * Musujime Awaki
 * Accelerator
 * Etzali (as Unabara Mitsuki)
 * Girl in the dress
 * Kakine Teitoku
 * Yobou Banka
 * Sunazara Chimitsu
 * Xochitl
 * Professor
 * Baba Yoshio
 * Saraku
 * Yamate
 * Teshio Megumi
 * Tetsumou
 * Saku Tatsuhiko
 * Mugino Shizuri
 * Takitsubo Rikou
 * Kinuhata Saiai
 * Frenda Seivelun
 * Hamazura Shiage
 * Elizard
 * Riméa
 * Carissa
 * Villian
 * Tatemiya Saiji
 * Itsuwa
 * Uragami
 * Ushibuka
 * Kouyagi
 * Isahaya
 * Nomozaki
 * Tsushima
 * Terra of the Left
 * Acqua of the Back
 * Fiamma of the Right
 * Vento of the Front
 * Lessar
 * Bayloupe
 * Floris
 * Lancis
 * Lola Stuart
 * Knight Leader
 * Last Order

Spoilers

 * The opening foreshadows several events that would occur in the timeline
 * Index's John's Pen Mode being activated.
 * Acqua of the Back vs. Kanzaki Kaori's battle in School District 22 and the Saint Destroyer, from Volume 16.
 * Acqua of the Back vs. the Knight Leader in the forest near Folkestone from Volume 18.
 * Hamazura Shiage vs. Mugino Shizuri, and Accelerator vs. Kakine Teitoku from Volume 15.

Trivia

 * A small snippet of the song is played in the second half of the Toaru Majutsu no Index III PV released during Comiket 94.
 * With 56 unique characters, the opening contains the record for most character in a single opening in the entire franchise.
 * Touma doesn't fight anyone in the opening unlike the previous openings.
 * Aleister Crowley doesn't appear in this opening, unlike the first opening of both of the previous two seasons.