Yukiteru always rejects offers to go out with friends, preferring to spend the time writing a diary on his cell phone. He has what he believes is an imaginary friend called Deus Ex Machina. However, one day Deus asks him to play a survival game along with eleven others. The winner becomes the next Deus Ex Machina. In order to win, the contestants must use their diaries of the future to eliminate one another. For Yukiteru to survive, he must team up with another diary holder, a girl named Yuno.

Lonely high school student, Yukiteru Amano, spends his days writing a diary on his cellphone, while conversing with his two seemingly imaginary friends Deus Ex Machina, who is the god of time and space, and Murmur, the god's servant. Revealing himself to be an actual entity, Deus grants Yukiteru a "Random Diary," which shows highly descriptive entries based on the future and forces him into a bloody battle royale with 11 other holders of similarly powerful future diaries. With the last person standing designated as the new god of time and space, Yukiteru must find and kill the other 11 in order to survive. He reluctantly teams up with his obsessive stalker Yuno Gasai (who also possesses such a diary), and she takes it upon herself to ensure his safety. But there's more to the girl than meets the eye, as she might have other plans for her unrequited love...

A short OVA that was bundled with the limited edition of the eleventh volume of the manga.

The Second is dead and the Gasai Yuno in the third world finally gets to live a happy life with her loving parents and friends from school. But there is still an empty place in her heart — it seems she has forgotten a person really close to her but simply cannot regain her memories...

Yuno Gasai lives a normal life as a first-year in high school. She gets along well with her parents and even has a small circle of friends. However, she cannot help but feel as if someone is missing from her life, someone so important to her that it was as if she had lived another life trying desperately to stay with them. After a class trip to the beach, Yuno returns home; but in the middle of the night, she receives strange messages from a voice only she can hear. The voice informs her of the person she is desperate to meet and that she must find him. Soon, she finds herself in a mysterious realm, her only goal being reunited with the person she cannot remember. Though obstacles stand in her way, Yuno will stop at nothing to meet her beloved once again.

When four-year-old Kun meets his new baby sister, his world is turned upside down. Named Mirai (meaning "future"), the baby quickly wins the hearts of Kun's entire family. As his mother returns to work, and his father struggles to run the household, Kun becomes increasingly jealous of baby Mirai... until one day he storms off into the garden, where he encounters strange guests from the past and future—including his sister Mirai, as a teenager. Together, Kun and teenage Mirai go on a journey through time and space, uncovering their family's incredible story. But why did Mirai come from the future?

In a quiet corner of the city, four-year-old Kun Oota has lived a spoiled life as an only child with his parents and the family dog, Yukko. But when his new baby sister Mirai is brought home, his simple life is thrown upside-down; suddenly, it isn't all about him anymore. Despite his tantrums and nagging, Mirai is seemingly now the subject of all his parents' love. To help him adapt to this drastic change, Kun is taken on an extraordinary journey through time, meeting his family's past, present, and future selves, as he learns not only what it means to be a part of a family, but also what it means to be an older brother.

It is the year 1995. Earth has been conquered by an alien army from the Saar cluster known as the Akron. The cities of Earth have been destroyed, and the remaining survivors live in harsh shanty towns and villages. Kento, a war orphan, hides within a cave along with his companions in order to escape some bandits. In the cave, they find the secret base of Dr. Earl, who was an inhabitant of the planet Helios, a planet conquered by the Akron. Dr. Earl then fled to Earth, bringing with him the greatest achievement in Helian technology: the super robot Daltanius, whose power is increased when combined with the intelligent lion robot, Beralios. Dr. Earl entrusts the fight for Earth to Kenta, who happens to be a descendant from the long disappeared Helian royal line.

Conan was the only child born on Remnant Island, a place settled by a group of refugees while they fled a terrifying wave of magnetic bombs that wiped out most of humanity. After 20 years, most of the castaways have died, save for Conan and the wise old man that raised him. Believing Remnant Island to be the last inhabited place on Earth, Conan is shocked when he discovers a young girl named Lana washed up on the beach one day. Though he is thrilled to learn that humanity has survived, Lana tells him the nation of Industria wants her as a hostage to force her grandfather, Dr. Lao, to power their machinery. Their conversation is cut short when Industria's top pilot, Monsley, suddenly appears and seizes Lana. Determined to save her, Conan immediately sets off from Remnant Island and begins a journey that will ultimately determine the fate of the world.

A rainy morning in April. Cherry blossoms are struck by the rain and floats in the puddle. High school students enter the school gate, carrying various colors of umbrellas. "Good morning, Ren," Yua greeted Ren, wearing wet tights in front of the shoe cupboard. When Ren faced her glumly, Homi, who was drenched, joined them as if she is jumping. The girls discuss the new semester. The girls live their irreplaceable school life as the seasons change.

Special included in the Blu-ray/DVD volume. Ren accompanies Yua to attend a photoshoot to model for an illustrator. To calm the girls' nerves, Homi runs a practice shoot.

17-year-old Moeka, who lost her parents, and Yurie, seeking to escape her violent husband, got off at a Kitsunezaki station one day. The great earthquake and tsunami had changed their destinies. Their lives were saved, but they were perplexed when asked about their identities at an evacuation site. It was an old woman named Kiwa Yamana who lent them a helping hand. From that day, Yurie was known as Yui, Moeka as Hiyori, and together with Kiwa, the three women began a wonderful communal life together at the old house "Mayoiga" overlooking the sea.