JoJolion is the 8th part of the long-running JoJo's Bizarre Adventure manga series, and takes place in the rebooted Steel Ball Run universe. Taking place in the year 2011, it follows Josuke Higashikata, a young man afflicted by retrograde amnemia as he tries to uncover his true identity in the coastal town of Morioh, which was affected by the Tohoku earthquake. During his search, he and his adoptive family gets into the unfinished business between his previous life and an impending inhuman threat.
[Source: dogparkdesu, Manga Modul; JoJo Wiki (for the series summary)]