
If you're looking for manga similar to Sanzu no Kawa de Waltz wo, you might like these titles.
Skyhigh Shinshou presents the stories of those souls who get to the Gate of Grudges. Izuko, keeper of the Gate of Grudges presents each soul with three choices: pass through the Gate of Grudges to heaven and be reborn, refuse to admit death and remain as a ghost on earth, or haunt and kill one person and then proceed to hell and eternal suffering. What does each soul choose and why?
After the body dies, the soul lives on. Many spirits progress toward the world of light, through the levels of the spirit world where they study how to improve their souls. These spirits are sometimes reincarnated into the physical world, and sometimes they are sent back as guardian spirits for other living people. Guardian spirits must protect their charge's souls from the blackness that oozes up from the world of darkness below. Riyon is a very laid-back spirit, who often skips her spirit classes to fool around. To train her further, she is sent back to the physical world as a guardian spirit. Instead of following a human from birth, she is helping a beleaguered man, the Japanese Prime Minister Kasuga Soichiro, in the last year and a half of his life. After an unexpected close call with death, Kasuga gains some unusual talents, including the ability to see Riyon. Will Riyon and Kasuga together be able to protect his battered soul?
When a person dies, their soul does not enter the land of the dead alone; a Companion must lead them to the gate that leads to the afterlife. Existing in a space between life and death, Aya and other such Companions will help carry those who have passed on to their final destinations, even if they refuse to accept their fates.
“Someday, I wish I could stumble across the memories of certain people that exist in the abyss by gazing at their pain, their sorrow, and the movements of their souls…” Follows ambiguous figures that stride through the snowy lands adjacent to the realm of the dead.
Middle-aged housewife Tatsuko dies after being hit by a runaway taxi, but before moving on she gets to return to life for one week by borrowing the body of Akihiko, a high school girl who survived the same accident.
For reasons unknown, former samurai Imanoturugi is obsessed with leaving the afterlife. To die in battle is a samurai's greatest honor, yet he is determinted to claim 1,000 swords from the fallen warriors who now share his residence in the dark underworld. By these means alone this highly skilled blades master will be allowed admittance back into the living world. But to what end? Upon what stone purpose does he sharpen his edge?