Kubo provided character designs for Madhouse's anime adaptations of Ango Sakaguchi's "Sakura no Mori no Mankai no Shita", Ryūnosuke Akutagawa's "The Spider's Thread", and "Hell Screen" by Ryūnosuke Akutagawa, which are parts of the "Aoi Bungaku" series. In 2018, Kubo returned to "Weekly Shōnen Jump" and published a one-shot, "Burn the Witch", in commemoration of the magazine's 50th anniversary. Later on, in 2020, the one-shot was serialized in the magazine with a seasonal release schedule. The 4-chapter first season was published in August to September 2020. A second season of the series has been announced.