When Ryuuta was 6 years old, he was attacked by a youkai. At that moment, a mysterious boy named Izumo came to his aid and exorcised the youkai. Izumo gives a promise that when Ryuuta gets strong enough to be by his side, they’ll meet again.

After 10 years, their paths cross once more. But it seems like Izumo doesn’t remember Ryuuta or their promise! When a youkai threatens the village, Ryuuta tries to help but Izumo ends up getting injured. At that moment, he transfers some of his power to Ryuuta...with a kiss! Together, they exorcise the youkai, with Ryuuta vowing to protect Izumo from now on and following him on his travels!

(Note: “Yokai” are supernatural spirits or monsters in Japanese folklore.)

Damaya with Site Pier Country court which received the life to summon the savior to save the world.
However, it was "Hanashika" that Damaya mistakenly summoned.
This is a story that a rustic house saves the world with rakugo.

From etc:

“Things that should not be touched by humans somehow find their way into this world. That’s why you should never, ever touch anything that is foreign.”
Follow the adventures of March, a Syste Behard, who hunts ils– evil creatures that lurk in fascinating objects.

Among the quiet villages and towns of 18th century Europe, demons known as the Ill hide within the most beautiful works of art, sparked to life by the torment of their creators. Attracted by their jewel-like allure, the unwary find themselves possessed by the Ill and driven to horrific acts of violence. Only the hunters of the Ciste Vihad can dispel the Ill.March is one such hunter, tracking the Ill from town to town to find the antiques that contain the demons before they can possess anyone. If the worst has come to pass, March's full powers are unleashed to battle the fiendish Ill. Born of tragedy, the artifacts all have their own tales to tell, as do each of their victims. But March's story may be the most tragic of all.

From Moon Bunny Cafe:

There are some guys who are bothering me. Just when I was grinding my teeth and planning to get back at them, I found a strange notebook!

From Batoto:

Haruno Kasumi, a 14 years old girl, is quiet and shy girl who gets bullied at school and has a crush on a classmate. Her mother has no interest in what happens at home and her dad disappeared years ago.

Her life changes drastically as she gets a gift from her long lost father...

Humans are distingushed between good and bad. Human souls would also be distinguished from Evil and good. In this world, there is a monster that was given birth by a type of soul. They attack humans, and try in vain to become the rule of the Earth.

Newman and Gwen are professional monster hunters who work for the Creature Removal Department, but for these two, killing monsters is the easy part, it's navigating their relationship that gets complicated. Set in a modern fantasy world, Newman is a mix of comedy, action, romance, and a little bit of horror.

Series of stories about Parasyte, from various notable mangaka.

The story of a young boy who decides to commit suicide, only to find himself in a strange world after his death, told in the form of a picture book.

A guy has a childhood friend who can change sexes at will. This friend is about to turn 15, at which point they will lose this ability.

Takahashi wakes up one day to discover he's turned into a woman. Curious about what it feels like to have sex as a woman, he asks his friend Hirukawa if he wants to have sex.

Peter Pan’s Neverland… is a land of fiction, but in this world, people will float into the sky when they feel happy or excited. But just one person, Fuji, is unable to fly into the sky freely. If he were to fly, his feelings for his friend, Nanao would be discovered. Fuji does his best to control his body so it doesn’t float, but Nanao, always his happy, floating self, comes to visit Fuji…

From Artificial Demons:

In the series, the Hino family picks up their "little brother" from the airport. The "brother" turns out to be Rilienthal, an intelligent dog who speaks Japanese. He is also the target of men in black suit from a mysterious organization. They refer him as RD-1.

1-2) Bokura wa Minna Uso Bakari

3-4) Kamiato ni Pride

5) Fuhoni Nagara Hodosarete Shimaimashita

6) Utakata Koi Zoushi

One day, I woke up to find that my cat has become a human!A new day with catboy.Original Webcomic: http://www.foxtoon.com/comic/catboy_catday/

Adell is the lone human being in a world of humans-turned-demons, made by Overlord Zenon. It's Adell's task - and burden - to defeat Zenon and restore his friends and family to their normal selves.

But summoning an Overlord is not easy.

When Adell tries to call Zenon, he ends up with his daughter, Rozalin. Now, bound by contract, Adell promises to take Rozalin back to her father.

However, it will take much more than blind courage to defeat her all-powerful father and save the world.

In a dark future, rival warriors of warring sects persecute nonbelievers and die for their faith. But a disillusioned young novice and a deadly gun-toting priest may be about to change all that…

Young Capria has completed her studies at the Arsenal School and has begun her internship with the Elysia Unification Council under Father Garrincha. But no lessons could prepare this sheltered novice for the outside world, where rebels battle against the dreaded "Testarotho." Heretics are tried and burned at the stake, warring religious factions battle for power, and the common people live a miserable life in feudal servitude. Can she bring a spark of hope to a world filled with destruction and madness? Maybe if she lives long enough!

These adorable non-human characters are a must-see! Alpaca, bird, rabbit, cow, cat, amphibian (salamander) and more!! At times erotic, funny, or sweet!

Imagine waking up one day to find that the sky around has been engulfed by an unidentifiable mechanical presence. Imagine that this new sky opens up and releases a Monomakia, a living weapon, whose sole purpose is to end your life. That's exactly what happens to 13-year-old Marin Asagi, an orphaned girl living in an alternate version of Tokyo in the 1970's. Young Marin's only chance to survive rests with Melan Blue, the Gun-Swordsman, who is destined to protect her. With arms made of weapons, the power of flight, and retractable body armor, Melan is a powerful bodyguard indeed.
Who is sending the Monamakia? Why do they want Marin dead? Who sent Melan to protect her? What is the secret of Brigadoon? With her new protector by her side Marin sets out across two worlds to discover the answers.