"Resister" (stylized as RESISTER) is a song by Japanese pop singer ASCA. It was digitally released on January 13, 2019, before receiving a physical release on February 27, 2019. The song reached number 14 on Oricon and number 21 on Japan Hot 100. It was used as the second opening theme of the anime Sword Art Online: Alicization.
On 9 December 2018, the official website of the anime Sword Art Online: Alicization revealed that the second opening theme song, "Resister," would be performed by ASCA. The song was released digitally on January 13, 2019, before receiving a physical release on February 27, 2019, in three editions: the Regular edition, Limited edition, and Limited anime edition. The single reached number 14 on Oricon, 27 on Japan Hot 100, and 8 on Japan Hot Animation, spending 9, 10 and 11 weeks on each chart, respectively.
In July 2019, "Resister" was certified gold by the Recording Industry Association of Japan (RIAJ) for 100,000 full-track digital ringtone downloads (Chaku Uta Full). The song was featured on her first album .
The music video for "Resister" was directed by Atsunori Toshi. The video features ASCA alongside a dancer, singing and dancing inside a factory setting. Some scenes show the dancer shooting a bow, while others depict ASCA and the dancer singing and dancing amid lightning effects. The video ends with ASCA taking a bow.