Paramount+ has unveiled two upcoming docuseries in its fall slate: one following TikTok heartthrob who enchants legions of online fans, and the other about a modern romance plagued by dark secrets.

Kodansha, the storied Japanese publisher behind global manga landmarks “Akira,” “Attack on Titan” and “Sailor Moon,” is expanding its creative reach with “The Escape,” the company’s first U.S.-created ...