If you're looking for manga similar to Gigigoegoe: Seonghyeongsu, you might like these titles.
Follows Mio Amasato, a high school girl who controls a bizarre mechanical doll.
It was only supposed to be an innocent hike... but when this group of friends took shelter in the mountains, their lives changed forever thanks to one book. Find all the twist and turns that ensue, as these teens slowly yet surely whittle down.
Dead bodies taken apart was just the beginning of a terrifying, thrilling adventure to take you to the world of Zanmu.
Kamishiro and Hanazono must face all odds, and his former allies, to save her from a fate worse than death and find a cure for the bloodlust disease, ID, which causes the infected to desire to kill their beloved.
Years ago, the mermaid inhabitants of an underwater brothel were ruthlessly slaughtered for their expensive body parts. The only survivors of this massacre were three young sisters who, enraged by having witnessed their mother's murder, now lure sailors into the depths to devour them. While chasing jellyfish one day, the middle sister, Julie, is caught in a net and hauled to the surface. She manages to escape from this ordeal alive, but during her brief time on land the mermaid fell in love with a human. Can the two lovers find true happiness together, despite their conflicting backgrounds?
For Na-Young, school was her only haven. However, that was only before these 'things' appeared one night in school.
Tetsuo Tosu is a typical father whose biggest worries are his job and his rebellious daughter, Reika. That is, until he finds a bruise on her face. His worst fears come true when he finds out she has a secret boyfriend…and he’s part of a crime ring that’s using her to steal her grandparent’s wealth. If that wasn’t bad enough, the thug catches Tetsuo snooping around and threatens to kill Reika as soon as she gets home. Fueled by fatherly instincts, Tetsuo murders the man…only for his wife to walk in and witness what he’s done. Now with a corpse to hide and a crime ring hot on his tail, Tetsuo must resort to his love of detective novels and his wits to stay one step ahead of a grim fate…
Having been abandoned by their mother, ten-year-old Kokoro and his blind little sister Yume have traveled to Hohzuki Island to start a new life. There, they join four teachers and four other students at a special school with few amenities; but soon, the pair discovers that something is terribly wrong. At least one student is missing and presumed dead, the teachers are hiding secrets from them, and none of them know if they'll ever manage to escape alive...