If you're looking for manga similar to Carpe Diem, you might like these titles.
Cheese is a boy who was raised in a prison where "criminals with superpowers" are held. But Eight, a new inmate who appears before him, has a "secret" that will shake the entire prison to its very core...!
Haru awakens in a hospital bed, having successfully received a heart transplant. He came to the facility for the operation, as it's renowned for its ability to get anyone a transplant no matter what, with no wait list required. But soon, Haru begins to remember his donor's memories, and begins to discover what's really going on behind the hospital's walls...
Two kids, Kouhei and Akio, made up an imaginary girl named Hajime to take the blame for destruction of the principal's copper statue. But one day, they meet a girl that is exactly like their description of Hajime, but only they can see her.
You'll meet him at 13:13 pm, on Friday the 13th. He'll do an uncanny intro where he plays a trick on you! And wherever he goes, trouble seems to always follow. Who is this person who creates such incidents? None other than Cool Shock BT!
On an island in the ocean, prisoners are sent to mine a mysterious and dangerous ore. One day, a soldier named Credo is sent to the island as a guard...
A tale of one woman's revenge. After being sent to prison for attempted murder, Nami Matsushima struggles to survive torture from the guards and her cellmates, so that she can escape and take revenge on the man who's responsible for all her pain.
Yukimaru and his friends investigate the Shiroyashiki as they look for their missing friends and run into the strange Room 303.
Oogimi Tsumugi is completely ignored at school because his parents are murderers and he has not talked to anyone in school for months. Then one day, a transfer student, Konohata Maya starts a conversation with him, but there's something eerie about her. She understands why Tsumugi is being ignored, but she seems to be even more interested after learning about his situation. What does Maya want with him and more importantly, what is she?