Kenshi Masaki, a 15-year-old boy who controls the white Seikijin, is ordered by a masked man to kill Lashara Earth, the ruler of the Shitoreiyu Empire, in order to return to his world. Chiaia Furan, Lashara's bodyguard, pilots her Seikijin and faces off against Kenshi, but loses overwhelmingly to his power even with the assistance of Wahanly Shume. After deciding not to kill the Princess, Kenshi is taken captive and held prisoner. While being held, all the girls are surprised at how Kenshi, a male Seikishi, has been able to do what he can until Doll rescues him and takes him back. The leader decides to eliminate him, but Kenshi easily takes his henchmen out with his martial arts and escapes. When he returns to Lashara with Aura Shurifon's aid, he catches a feverish disease called Rhodeshiya Tore, which Ulyte states that he will die in the next six hours if they don't treat it.

After seeing Kenshi's capabilities in battle, Lashara decides to make him her servant while concealing the truth about him being a Seikishi from the others. Kenshi witnesses the Holy Land and the academy that Lashara and Chiaia attend. Kenshi becomes more aware of his duties as a servant while making new friends, and meeting Chiaia's older sister Mexiah. Kenshi has a brief witness between Chiaia and a man named Dagmyer Mest, a childhood friend of Chiaia's. Kenshi meets Aura in the forest and later aids Ulyte before he gets sick. Kenshi later meets Maria Nanadan, Lashara's cousin and princess of Havoniwa, and her assistant Yukine. At the end, both Wahan and Chiaia are appointed advanced Seikishi.

Lashara decides that Kenshi should work to "earn" his meals, and is later introduced to the Headmistress of Holy Land Academy where he is later assigned various jobs on his first day. Not only he is demonstrating all expertise in all areas of work, he becomes famous among the staff members and those who study at the academy. During the process of Kenshi's pay going towards Lashara, she realizes how much money Kenshi has made and decides to make him continue working. Kenshi is later introduced to Lithia Po Chiina, the daughter of the Pope and President of the Student Council, and her assistant Lapis. Later, he is hypnotized by Mexiah to become a "massaging machine", which he gives to Chiaia, Aura, Lithia, Yukine, Wahan and some other girls.

Kenshi continues his duties to serve Lashara while working and attending the Academy. Maria attempts to get Yukine and Kenshi together after seeing how much affection she has for him, while Kenshi is being chased by girls who have fallen for him. Later, while Kenshi talks about his past with Lashara and Chiaia, Chiaia accidentally breaks the string and replaces it with a red string, which symbolizes love much to her chagrin.

Dagmyer has given passage to the bandits, while Lan, a member of the bandits is infiltrating Holy land Academy. Dagmyer persuades the Student Council to hold a warrior tournament, and all the female students and staff placed bets on Kenshi to win the race. As the race commences, it ends up being Aura and Kenshi as everyone cheers on, and later ends with Kenshi being the victor after Aura gives up. Shortly after running crazily around the Holy Land, Kenshi finally collapses and Aura is beside him, realizing that she is in love with Kenshi, and kisses him while he is still resting. Unbeknown to everyone, Uylte and Dagmyer begin their assault with the enemy forces as well as the male Seikishi aligning themselves with Dagmyer.

It`s summer vacation and Queen Flora of Havoniwa invites Lashara and all of her friends to stay at a Havoniwan retreat. Unfortunately, things can never be just fun and games--a group of bandits have their eyes set on the resort they will be staying at! Source: crunchyroll

The Student Council decides to hold a competitive sports tournament. Lashara becomes the official bookmaker, but her plans to get rich quick are dampened when everyone starts placing their bets on Kenshi. Will Kenshi live to make it to the finish line? Source: crunchyroll

Dagmyer and Babalun initiate a surprise attack on the Holy Land. Not only must Lashara must help evacuate the students and faculty, but she must also try to stop the assault. Failure to do so could land her in hot water as the Princess-King of Shtrayu. Source: crunchyroll

Dagmyer devises a plot that will let him not only kill Kenshi, but also steal Lashara`s ship. Now Lashara and her friends must foil Dagmyer`s plans. As if that weren`t enough, they must also come up with a way to win over the warrior-like King Shurifon. Source: crunchyroll

It has been made clear that Kenshi is the only one capable of fighting Gaia. Whoever owns him will possess the only key to defeating Babalun. Although this issue has been brushed aside in the past, it must now be addressed in earnest. Source: crunchyroll

Although the journey to the Barrier Workshop has been a long and hard one, Kenshi and his crew manage to make it there in one piece. Chiaia`s father, Naua, tells Lashara and her friends the dark past of an ancient civilization and the Sacred Mechalord. Source: crunchyroll

Kenshi`s new Sacred Mechanoid is impressive, but he needs a mighty weapon to go with it. Kenshi must make his own legend-worthy sword. As if that weren`t bad enough, he has to fend off Lan and her group of bandit friends while he`s making it! Source: crunchyroll

It is time for the final showdown, but first Kenshi must somehow make it to the Holy Land. Lan has been placed in charge of the main gate, which is actually a massive fortress! Can Kenshi and his friends overcome impossible odds? Source: crunchyroll