TOARU KAGAKU NO RAILGUN: MISAKA-SAN WA IMA CHUUMOKU NO MATO DESUKARA

Continuing after the Level Upper incident, another phenomenon torments Misaka. A phenomenon called "Someone's Watching," its effect feels like the electricity in one's body flow backwards. With the help of her friends, Misaka fights against the unknown enemy. — Description from AniList community (anilist.co).