Made in Abyss is a Japanese web manga series written and illustrated by Akihito Tsukushi. It has been serialized on Takeshobo's Web Comic Gamma website since October 2012, and its chapters have been collected in 14 tankōbon volumes as of August 2025. The story follows an orphaned girl named Riko, who finds and befriends a part-robot boy named Reg, and descends with him into the titular "Abyss" that leads deep into the Earth, in hopes of exploring it and finding her mother.