Genji, a protagonist from classical Japanese literature, slips through time from the 11th century to modern Tokyo. Or more specifically, into the apartment of Fujiwara Saori!

Subaki Sadamitsu is a young punk and Leader of the Corpse Gang who, after a chance encounter with an alien robot, is forced to take up the task of capturing rukeitai (intergalactic criminals). His job is made harder with the appearance of the Vulture, a last ditch effort to keep the rukeitai under control.

The story of Steins;Gate takes place in Akihabara and is about a group of friends who have managed to customize their microwave into a device that can send text messages to the past. As they perform different experiments, an organization named SERN who has been doing their own research on time travel tracks them down and now the characters have to find a way to avoid being captured by them.

From Kirei Cake:

It's been declared that Nishi High will close in two years. Since then, the student population has dropped to a mere seven. Hazakura Motoya, one of the remaining students, decides to stay for the free ride through high school.

Suddenly, everyone is shocked when they receive three new transfer students, Kayama, Mizumura, and Toujou, girls who are actually members of a special military division.

Soon after, Motoya and the three girls witness a giant tower suddenly appearing on the school grounds. Motoya is destined to enter with the girls in order to uncover the mysteries of this tower.

<Cheating Men Must Die> Side Story. The beginning of intern Su Lüxia journey of abusing scum.

Qin Yu was killed a few hundred years into the future during the apocalypse due to a misjudgment. He then traveled back in time before the apocalypse kick off, relying on his battle hardened apocalypse experience and techniques, Qin Yu rapidly developed into a formidable opponent, passing through hurdles, saving the world all while protecting his beloved sister.

From Storm in Heaven:

Kasane is your average kendo-obsessed girl, when a brush with a mysterious sword sends her back in time to the Sengoku Era. Stuck in an unfamiliar time and place, Kasane also has the poor luck of winding up right in the middle of the turmoil that surrounded Oda Nobunaga's rise to power!

Marking the end of one's youth--the high school graduation ceremony. Itsuki, the elder of the twins, spent the best graduation surrounded by friends and his girlfriend. Haruka, the younger of the twins, spent the worst graduation all alone. During the ceremony, the two accidentally fall from the roof--and find themselves back in time at the entrance ceremony. From there, the two's "retry" at youth begins.

——Aah, if I had do it all again, I'd rather die.
Adventurer Lughys spent his days as a loser. Opporessed by his party members, so called "comrades", the road to being a hero or a legend was a long ways away. Then suddenly, a mysterious shadow called out for him, giving him the chance to return to his past, and told him he'd be given only one chance.

He longed for it—— This time, he'd obtain valor and honor, and love.

However, the god of fate would not permit it. A battle with a great magical beast, an attack on a noble house, challenging a quest with the hero—— For far and away from his expectations, he gets entagled after rescuing someone. Unbeknownst to him, his dream took a 180, and from the girls in his former party, came a twisted attachment and affection.

There's only one chance at this. ——Now, why not take back the future? Revenge dwelling in a dark, hot flame, and turning the tables in a Replay Fantasy!

A story of a villain, Fang Yuan who was reborn 500 years into the past with the ChunQiu Cicada he painstakingly refined. With his profound wisdom, battle and life experiences, he seeks to overcome his foes with skill and wit! Ruthless and amoral, he has no need to hold back as he pursues his ultimate goals. In a world of cruelty where one cultivates using Gu - magical creatures of the world - Fang Yuan must rise up above all with his own power.

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?