Moriyama Rin was born with an incurable disease. Despite her best efforts to live a normal high school life, Shimehara Satoshi was the one who ruined it at the very end.

'I wish I didn't say I liked her.'

Satoshi, full of regrets, experiences a time leap and meets Rin for the second time.

'If I don't involve myself with her, Rin will be able to spend her short time left and end it with a smile...'

A 14 year old is going to confess to her senpai who is graduating. The next morning, she wakes as a 29 year old single woman, living with 3 sisters: a high schooler, middle schooler and an elementary schooler.

Following a temporal war that ravaged Japan, the young Shoichi, his two sisters and other children must flee their homeland by boat. During this journey, they are attacked by strange suitor samurai from the future. A girl named Shizue is even "draw" the face by an unknown life form. The children will be rescued by the crew of a strange battleship, the Yumihari. On board, Shoichi can only note that Shizue, curiously has no further injury...

After three unfulfilling years of high school, Imamura Kinichirou was finally graduating. Because of his delinquent-esque looks, he was feared by his classmates, has made no friends, and his greatest regret was not joining the ouendan (cheer club), which was now disbanded. After an accident on the day of his graduation, he and classmate Fujieda Aki are transported three years back in time, freshman again in body but with high-school memories intact. Can Imamura fix the mistakes of his past? Can he re-do his high school years in the way that he's always wanted? Again!! The universe suddenly shouts.

An alternative take on Mazinger Z, in the future, the world was destroyed by the demon know as Mazinger Z and the only human that is left on earth is Kouji Kabuto, he is given the chances to save humanity, by sending him back in time by a mysterious Minerva X, in this take the history is for adults, with nudity and blood that may be too much for some fans of the original version

If no one has sex, mankind will go extinct!? A Sexy Terminator who came from the future to stop the world's virginization, attacks the the genius eroge creator/virgin, Adachi!! Can he protect his chastity and make the best eroge of all time!?

Utsunomiya has been a single virgin until all the way to his 30th birthday. Then one night on his way home from work, something happened that caused a shift in time which made him go back to the past during his days in high school. There, he meets his teacher Shitara-sensei again and somehow they end up living together!?

This series is a painful love story of a return to the past to erase the first love. Ritsu, the main character, goes back to the past to change the future since her lover Ichijou Kaname is going to die and she tries her best to avoid him and suppress her love.

One's life can be changed in a brace of shakes. And little Asahi is unlucky in that: she suddenly finds herself in a strange world where people worship the mysterious water god. The girl is sure that the whole story about gods is just a mere fable but... why and whom is she sacrifiсed to?

A young artist of anthropomorphic military machines slips through time and finds himself in the year 1939 on Mongolian-Manchurian border where he discovers a rather unusual fan of his work in the form of Japanese tank crew commander.

After her parents divorced, Cong Cong has been living alone, one day she goes to meet her idol, falls down a flight of stairs and travels through time.

Shinonome Neo, 28 years-old and single. During his school life, he was disturbed by his senpai, Maki Yuuki. That is how, ten years later, he can't trust in other people or even have a girlfriend; when he receives the invitation to the wedding of Maki, he decides to take revenge and spoil it... But destiny is cruel with Neo and he dies... After this, his spirit travels back in time and gives him the oportunity to change everything, avoid the ruin of his entire life and his death, so with the help of 15 years-old Neo, he is going to change the future.

I broke up with my boyfriend of 10 years. Out of nowhere, I received a phone call from him asking for help. But, why does he suddenly look so young when I went to meet him?

The day started as any other day for the three sisters, Tsumugi, Momo, and Rin, and their father. But they soon learn that everyone has disappeared and they appear to be the only humans left on earth. How will they survive?

“I will die this summer.” Eden is a member of the Timekeeper family, who possess the ability to travel back in time. Their date of death has been set since the day they were born... and the summer of 2018 is when Eden is destined to die. On that fateful day, , he decides to confess his feelings to his longtime crush. But Jay, who is straight and only cherishes Eden as a friend, is flustered by Eden’s confession and reacts badly. Caught up in his thoughts, Eden is met with a fatal accident—and thus his time travel begins. He finds himself on the last day of the high school summer camp training where he first met Jay. Given the opportunity, will Eden be able to change anything that happened on that day, 20 years ago?

An omnibus collection of short stories.

The manga's story follows Kimura Shigenari, a real-life samurai who served Toyotomi Hideyori. Kimura fights in the Siege of Osaka in 1615, but is hit with a mysterious light. He wakes up in a land ruled by England's legendary King Arthur.

The plot is about Japanese teen Yamato Hibino, who is sucked through a time warp into the past, where the dinosaur army of the Dragonia Empire threatens the world, and Queen Aira of Mu needs Yamato to help her fight back with the aid of the stone-made guardian God Mazinger, which looks suspiciously like a giant robot.

It's New Year's Eve, and there's a countdown party at the luxury hotel, Babel. Kouta, a new hotel employee who's dissatisfied with his own status quo, finds his fate forever changed following an encounter with two mysterious guests: Ozaki and Naomi.

On New Year's Day, he bears witness to a world-changing event. And with The Babel as his stage, navigating a complex web of human relations, Kouta's mission begins!

Mitsuhiko Amano is full of regrets. A 46 year old salariman who had just been laid off, he was told that his wife wanted a divorce, something that he might have been wanting for years. So he visits a soapland, a place he hasn't been since he started dating his wife 22 years ago. While there, a fire suddenly erupts, trapping Amano and a soapland girl in the bath. In a rare moment of bravery and decisiveness, Amano attempts to lead the girl to safety, only to slip and hit his head. As his consciousness fades, he sees the back of the soapland girl making her escape... A fresh set of regret blankets him as he passes out, that his wife Sachiko and daughter Miyu will be objects of ridicule that he died in such a place...

Then he awakens. In front of him is Ozawa Satsuki, a girl he hardly knew but secretly liked in high school. And Takahasi. Nakao-san, and Iijima-kun too. All his high school friends in their high school uniform, in their, and his, old high school... He has slipped 30 years into his past.

Has he been given a second chance? To change his life so that the regrets that weighed him down never happen this time around?