Dandadan (ダンダダン), also script displayed as Dan Da Dan, is a Japanese manga series written and illustrated by Yukinobu Tatsu [ja]. It has been serialized in Shueisha's Shōnen Jump+ app and website since April 2021, with its chapters collected in 18 tankōbon volumes as of January 2025.
Momo Ayase is a high school girl who believes in ghosts but not aliens, while her fellow highschooler, Ken Takakura, whom Momo nicknames "Okarun", believes in aliens but not ghosts. In a bet to determine who is correct, the two decide to separately visit locations associated with both the extraterrestrial and the occult—Momo visiting the former, and Okarun visiting the latter. Momo is abducted by a group of aliens who accidentally unblock her chakras, enabling latent psychic abilities. Meanwhile, Okarun is possessed by a spirit who takes over his body. By using Momo's abilities and Okarun's possessed form, they defeat the aliens together. The rest of the story follows the two, as they team up with fellow students, friends, family, and new acquaintances to fight spirits and aliens; the overarching plot themes include retrieval of Okarun's penis and testicles (kintama) and the development of romantic feelings between Momo and Okarun.
The main characters of the series are the "Family" (家族, Kazoku), a group of kids led by Seiko dealing with the supernatural. The members of the Family who also attend high school at Kami High are also members of the History and Culture Research Club (歴史文化研究部, Rekishi Bunka Kenkyū-bu), which serves as a front for their activities.
The series follows two teenagers with supernatural powers fighting yōkai and aliens with help from multiple allies. An anime television series adaptation produced by Science Saru aired from October to December 2024. A second season is set to premiere in July 2025.