It's the summer of 1945. 3 years have elapsed since the war between Japan and USA began. Gen is a young boy living a struggling yet satisfying life in the city of Hiroshima, that has been strangely spared by the bombing taken in almost every other Japanese City. Food is scarce, and Gen's family is suffering from severe malnutrition, which endangers his pregnant mother. There isn't much spare time as Gen and his little brother Shinji help their father and mother at work and try to make sure their family survives the tough times. Little do they know, what the Americans have in store for the city of Hiroshima and as of the 6th of August 1945, their lives are about to change dramatically.

The heroine is a normal girl, until one day she is invited to another world and becomes the princess of the dream world, where people use dreams as the energy to live. One day, the dream world is being attacked by something called "yumekui" ("dream eater"), and many princes are being attacked by it. The heroine must wake them up to save the dream world, as the princes are unable to wake up due to having their dreams stolen.

In the country of Rimguard, a mysterious event shook the country and its people just 12 years prior. As time passed, memory of the incident began to fade while peace reigned over the land. Sisters Yui and Rena live a quiet life in the Enastria Empire until a large mecha suddenly attacks their peaceful home, changing everything. The girls become caught in a vortex of destiny and godly revival. (Source: FUNimation)

After the unexpected death of her father, 11-year-old Momo Miyaura leaves Tokyo with her mother and moves to an old remote island in Seto Inland Sea. The only memento she has from her father is an unfinished letter with only two words inside: "Dear Momo"—along with her heart's unrest from it.

In the new and unfamiliar small town, Momo reluctantly tries to adjust to the outmoded wooden buildings, silent crop fields, and mysterious isolated shrines. One day, while exploring the attic of her new home, she finds a worn out picture book about youkai. Following this discovery, strange things begin to happen around town, and Momo is greeted by the arrival of three troublesome youkai.

Momo e no Tegami tells the story of a young girl as she struggles to adapt to her bizarre new life and ultimately come to terms with her father's mysterious letter.

[Written by MAL Rewrite]