However, these mid-bosses kept getting defeated by the heroes, who continued to grow stronger with time. Which led to the demon king’s army needing to produce even stronger mid-bosses.
It was at that time that a certain demon stepped up.
Demonstrating great wit, she became the demon world’s founder of the official mid-boss training academy!

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.

Nishino Gokyou, the dull faced highschooler in the middle of the school caste, and the one with the greatest abilities in the neighborhood. While caring about his appearance, he spends everyday burying himself in his work that makes use of his ability. He has deemed this life of solitude as acceptable. However, those days would not last. The fall of his second year, the virgin recognized the preciousness of youth through the culture festival. He learned of the importance of friendship with the opposite sex. With this, that boy Nishino decides to turn over a new leaf from the simple life he had, along with revising his attitude towards his every day life, and in order to make a wonderful girlfriend to enjoy his high school time, he uses every means in his disposal to struggle up the school caste, but the chance of climbing doesn’t look great, this is, what do you call it, a hard-boiled story (Along with super-powered battles)

Yoh Asakura is a shaman--one of the gifted few who, thanks to training or natural talent, can channel spirits that most people can't even see. With the help of his fiancée, Anna, Yoh is in training for the ultimate shaman sports event: the "Shaman Fight in Tokyo," the once-every-500-years tournament to see who can shape humanity's future and become the Shaman King. But unfortunately for Yoh, every shaman in the world is competing for the same prize…

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!

After having been sealed for 300 years, the demon lord Giri reawakens and sends off his monster minions to wreak havoc in the world. King Uruga XIII decides thus to place announcements everywhere in the kingdom in search of a legendary hero who can defeat Giri. In the king's castle will be held a competition to discover who the true hero is. Forced by his hero-wannabe parents to go to the castle, Nike first visits the witch's house, where the magic-learning Kukuri joins him. Together they travel around the world defeating monsters, gaining new abilities and trying to uncover the mysteries surrounding the Migu Migu tribe.

“The “Footstamp operation” … … what the hell really happened there!?”
Okinawa, summer of 2112 before Tsunemori Akane is assigned to Division 1 of the Public Safety Bureau Criminal Investigation Department.
Sugou Teppei, belonging to the 15th unit of the joint task force of the National Defense Forces, is taking part to a military operation as an excellent pilot.
Three months later, a case where an unmanned armed drone attacks Tokyo and the Ministry of Defense begins.
In order to investigate the case, Masaoka Tomomi, enforcer at the Criminal Investigation Department’s Division 1 who went to the National Defense military base, comes near the truth behind the case with Sugou.

Jan Akiyama, a cocky arrogant teenager wants to fulfill his grandfathers wish of defeating his arch nemesis Mutsuju Gobancho. When he arrives at the Gobancho restaurant he meets his granddaughter Kiriko Gobancho. Their rivalry is easily compared to Jan's and Kiriko's grandfathers, for Jan believes cooking is about competition and Kiriko believes cooking is about heart.

This is a story of a man who is cursed to live a life of solitude! Whether the ladies be eight or eighty years old, his cursed ability would affect them. Even the slightest of skin contact would cause any woman to fall into an uncontrollable state of lust and desire. Thus our hero, Sun Lang, journeys through this word in search of a way to lift his curse. He swears upon his life, that before he dies, he will regain the ability to innocently help an old lady cross the road!

Based on the Shin Megami Tensei If videogame.
The setting is Karukozaka High School, which is mysteriously sucked into a void and emerges in the realm of Makai, a world of demons. Most of its students and school employees are trapped in the other world along with it.

It's been 18 years since Rin died. Alisa, who is Sei and Lou May's daughter, lives with her mother, her brother Shinji, and Ken in Hawaii. Shinji is Ken and Lou May's son. Shinji knows Alisa isn't Ken's real daughter, but Alisa doesn't. Alisa sometimes sees a phantom boy. One day, she sees a boy point to the sky, where she sees a plane. By the plane, Rie, Shin's son, comes to ask Ken for some help. He also knows Alisa is really Sei's daughter. Alisa is called "Dragon's daughter." Rie says a prophet told him that he would marry a woman who's a dragon's blood relative. When they go into the forest, Rie also sees a boy. Alisa tells him that the boy is a phantom and that he is the only other person who can see him. Her family had told her that the boy was the spirit of the forest, but she doubted that. She thinks the boy is trying to tell her something.

From Hidoi~! Translators:
Masaki Umeo is a middle schooler with a nasty temper. Because of his temper, he is causing all sorts of problems and is constantly involved in fights causing his sister to worry about his well-being. One day, he stumbles upon an Aikido class which he becomes interested in, but soon dismisses it until he meets Daniel- an english teacher from Canada. Daniel teaches Umeo about the way of Aikido in hopes of giving Umeo a different outlook in his life, but it isn't that simple because there is a dark reason behind Umeo's temper.

Qin Fei is an ace agent in a special school. She was betrayed by her partner and lover when she was performing a mission in the Bermuda Triangle. She fell into the sea from the boat and into a crack of time and space, meeting a vampire on first day. The battle of a modern female agent against the ancient "old Draculas" in full swing.

——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!

Fang Haotian is a young boy who is deeply in love with a girl called Ningyu, but her parents are opposed to their relationship. Ningyu is arranged for marriage to another man. Can he become strong enough to take back his beloved Ningyu from this man?

A mysterious Japanese man, known only as "Zig," travels to the world's conflict areas and undertakes various jobs. When the story begins, he's working as a security guard at a bank that's suddenly taken over by terrorists.

Super Dragon Ball Heroes: Dark Demon Realm Mission! is a spin-off manga.
It tells the story of the conflict between the Time Patrol and the Dark Empire.

Lupin the Third and his motley crew return in Shin Lupin III! This time, several of the stories are either brand-new or adapted from or to the Lupin Part 2 anime, and the beginning story was even animated by itself several years later! Lupin the Third is the grandson of the famous literary thief Arsène Lupin, and his partners in crime include the sharpshooter Jigen Daisuke, the stoic samurai Goemon Ishikawa the Thirteenth, and the on-again-off-again lover/rival Fujiko Mine. Their object is to steal the most valuable and important items while evading the guard of Inspector Koichi Zenigata, the ever-vigilant ICPO chief whose life goal is to capture Lupin, but when it’s fulfilled, he’s lost his purpose! What kids of exciting adventures will they get themselves into in...Shin Lupin III!

A seinen take on Saito's classic Survival. It tells about the drama of those who survived the fall of a meteorite on the Pacific Ocean after a failed attempt of destroying it with a missile. Cities are destroyed by big earthquakes, food runs short, illness spread quickly. In the midst of this scenario, Ootomo, the main character of this series, will do whatever in order to survive.