Made in Abyss Book 2 includes issues 9 to 16 of Akihito Tsukushi’s archaeology adventure manga Meido in Abisu.
Riko is determined to find her long-lost mother Lyza, who disappeared into the kilometres-deep Abyss. Riko and her robot boyfriend Reg have sneaked out of the orphanage and headed into the Abyss. Foolish kids. There are many dangers in the depths; if they do manage to reach the bottom of the Abyss, they cannot return. Or so it is said.
Their journey has hardly begun when they realize that someone is pursuing them.