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Akashi Eito has failed miserably on all high school admissions exams but somehow, he receives a letter of acceptance from a school he does not remember applying for. He nevertheless happily enrolls, expecting to live the ideal school life, but his aspiration are quickly destroyed as he discovers that this mysterious school is a training institution for secret agents!

Immediately, Eito wants to return home and live a normal life with his normal family, until the director of the school makes a shocking revelation: Eito's deceased father was also a secret agent! He subsequently wants to know more about the past and memories of his father, so he decides to stay in this school. However, as a student of this institution, Eito will have to face a deadly exam made to test the skills of all new students...

Follow this story of action and espionage, in which our hero, who lacks physical strength, compensates for it with great bravery, and captivates everyone around him with the power of his courage and friendship!!

(Source: MU)

The story focuses on Kenichi Shirahama, an average 16-year-old high school student who has been picked on his whole life.
However, on the first day of class, he meets and befriends the mysterious transfer student, Miu Fūrinji.
Driven by his desire to become stronger and to protect those around him, he follows her to Ryōzanpaku, a dojo where those who are truly strong and have mastered their arts gather (Ryōzanpaku comes from the Chinese story of Heroes of the Water Margin who train together at Liangshan 梁山).
After learning basics from Miu, Kenichi is able to beat a high ranking member of the school's karate club, and becomes a target for all the delinquents in the school.
Kenichi's reason for training is to fulfill the promise he made to protect Miu. Subsequently, Kenichi's daily routine is divided between hellish training under the six masters of Ryōzanpaku, and his fights against the members of Ragnarok, a gang that views him as either a possible ally or an impending threat to their plans.
After defeating Ragnarok, he faces a new enemy called YOMI, a group of disciples who are each personally trained by a master of an even bigger organization rivaling Ryōzanpaku, Yami. He realized that he wanted to be the strongest in order to protect everyone without killing anyone.
Along with former members of Ragnarok who joined the Shinpaku Alliance, a group created by Kenichi's schoolmate Haruo Niijima, Kenichi now fights Yami to prove his ideals and protect those in need.

Tatakae! Ryouzanpaku Shijou Saikyou no Deshi, relates the story of a peaceful yet weak boy, who one day, after being beaten up really bad by some of his school comrades, decides that being bullied around isn't an option anymore. Seeking revenge on his bullies, the young boy, Shirahama Kenichi, decides to join a fighting dojo. But what he doesn't know is that the dojo he wants to join is actually a place of gathering for those who have mastered different types of fighting styles. Thus begins his journey..

This is the original version that History's Strongest Disciple Kenichi is based on.

There are people in the world who have strengthened their heart and spirit beyond imagination; so much so that they are able to materialize objects just by willing it and its potency is only limited by the users' determination. These people from the far east call themselves the Wazabito and are admired for their power that transcends the physical universe.
Tekuni is a cute Wazabito swordswoman who is traveling the world to train and master her abilities. With her friend Huk-Ro, the owl of knowledge, Tekuni wanders from one danger to another and makes friends in the process.
(Source: MangaHelpers)

Yaegaki Meguru's next door neighbor is unique, to say the least. They are the Kusanagi ninja lineage, and their son, Kanata, has been her classmate and friend since their younger years. Kanata would always get into trouble or be late to class due to his ninja upbringings. Every morning, Meguru would have to pull him away from his training with his father. Most days, he's late to class anyway.

In the past, they both vowed to never hide secrets from each other, yet Kanata would not reveal the "true purpose of a ninja." Meguru understood the reason behind Kanata's secrecy regarding his ninja background when a powerful force is released inside their own school. Then, Kanata will reveal his true potential as a ninja.

(Source: MU)