Watanabe, Michiaki

Pandora's Box led a cursed existence. Through the curiosity of a woman, evil was unleashed and very nearly covered the world in darkness. Miraculously, humanity managed to seal Maou Kestra back into the box, but only with immense sacrifices. Even without their lord, the demons are still a formidable force that has only grown stronger with time, locked in the abandoned capital of the North, Hameln. Fifteen years have passed since that fateful battle...

Meet Hamel, a travelling minstrel who is so self-centered that he'd sooner cook his guardian crow (and family friend), Oboe, than go hungry for even a minute. Welcome to the world of music and hilarious insanity that is the Violinist of Hameln. Watch as Hamel takes cheap shots at his opponents and bashes pigeons with his giant violin and turns them into dinner.

How WILL the world be saved from Maou Kestra with a hero such as this?

(Source: MU)

Hameln no Violin-hiki

ハーメルンのバイオリン弾き

Adachi, Mitsuru

The story is set in a place very similar in appearance to Earth in the Edo period. However, Adachi (the mangaka) regularly reminds the reader all throughout the series that the setting is another planet in the distant future which just happens to look like Earth.

After the death of his mother, Shichimi sets out to join his step-brothers and -sister who live together in Karakuri Tenement, a place provided by the father they have never met. He finds out that each of them had different mothers (all of whom have died), but were fathered by the same man. Not long after Shichimi's arrival, the siblings decide to journey to visit the graves of each of their mothers. On this journey, they encounter many dangers.

(Source: Wikipedia)

Nijiiro Tougarashi

虹色とうがらし

Manabe, Jouji

It`s face-to-face confrontation when Kahm stares down her father and refuses to end her relationship with Tetsuya. In retaliation, her father sends a punitive fleet to Earth -- with orders not only to crush the rebellion but to annihilate the entire solar system!

(Source: Amazon)

Outlanders

アウトランダーズ

Kanzaka, Hajime

Araizumi, Rui

Young sorceress Lina Inverse and her dim-witted sidekick Gourry Gabriev travel through a somewhat medieval setting, doing good and fighting evil. Well, by "doing good and fighting evil" I mean "stealing from corrupt rich people and blowing things up".

The stories in this volume are occasional tie-ins to the novels and short stories. 

(Source: MU)

Slayers: Medieval Mayhem

スレイヤーズ

Fujiko, Fujio F.

One day, Mami realizes that she has magical powers. Her mother also had those powers, as well as her grandmother. Mami slowly has to learn to live with her abilities, and she gets into a lot of trouble.

Esper Mami

エスパー魔美

Fukushima, Masami

Miyazaki, Tsutomu

This series is self-titled "Fleshbomb Masterpiece." The first chapter is full of flexing muscles, sweating, flowers, and more flexing.

(Source: CheapManga)

Saint Muscle

聖〈セント〉マッスル

Matsumoto, Leiji

Collection of short, humorous stories by Leiji Matsumoto.

Wadachi

ワダチ

Tokuhiro, Masaya

Tar-chan protecting the peace of the jungle, Jane, and his animal friends with comedic results. The series would often use sexual humor, such as Tar-chan stretching his scrotum like a flying squirrel in order to fly through the air.

Shin Jungle no Ouja Tar-chan

新ジャングルの王者ターちゃん

Sanjou, Riku

Inada, Koji

1-2. Dragon Quest IV Gaiden: Jigoku no Meikyuu
3-4. DQ I Hiden: Ryuuou Baribari-tai

Dragon Quest IV Gaiden: Jigoku no Meikyuu - Dragon Quest Tanpenshuu

ドラゴンクエストIV外伝 -地獄の迷宮- ドラゴンクエスト短編集

Yasunaga, Kouichirou

Daizou Sudou attends Nakano Army Prep School with his older classmate, Ozuma Arikawa while battling the minions of the Nanban Empire, a secret organization bent on world domination.

The series started as

Rikugun Nakano Yobikou

陸軍中野予備校

Iori, Tabasa

Kunai Kumori comes from a long line of vampire ninjas and upon his 14th birthday, his father decides to entrust the family duties to him. He is now responsible for tracking down and killing other vampire ninjas. Armed only with his father’s sword and a strange ability that allows him to grow taller when he drinks the blood of others, he sets out on his mission. (Source: Baka-Updates)

Kunai Den

クナイ伝

Ishinomori, Shoutarou

Chobin is a funny creature that falls on the ground after the capture of his home planet by the tyrannical forces of Brunga, a demonic figure in a dark coat with bat-like wings.

(Source: MU)

12 Manga Like Sonic Generations