Martial King's Retired Life - Chapter 44Book 15:

After ten thousand years of cultivation, he could have achieved immortality. However, his lack of human experience led to his failure to attain immortality.Thus, he resolved to immerse himself in a century of human existence, seeking to enhance his journey toward immortality. What he didn’t anticipate, though, was that upon entering the human world, he would find himself cast as a son-in-law, facing disdain not only from his wife’s parents but also from his beautiful wife herself.Armed with a wealth of cultivation knowledge, how could he transform his drab human life?

When The Cute Kunoichis Spied on Their Teacher's Secret is a light novel written by Kazuma Kamachi and illustrated by Ryuushi Tajima.

The story takes place in a world where Japan never ended their isolationist phase, and agents from foreign powers are always threatening to steal the country's advanced technology. In order to combat this threat there has been a resurgence of ninjas that use Strategic Martial Arts, techniques that combine cutting-edge modern technology with a traditional foundation of martial arts and ninjutsu. The story follows Souha Sugiyado, a 17-year old ninja instructor and former ninja prodigy who was forced to retire from active duty by the wounds he suffered in his last mission. Souha's four students are all kunoichi who have all gained the rank of Elite Ninja, the highest official rank available to ninja. However, one day two Shogunate ninja approach him with the news that his four students have gone rogue and have stolen a portable modular nuclear reactor, and thus they ask for his help in bringing his students to justice.

In this world, a cataclysm has caused the appearance of monsters and other disasters, emerging from dimensional rifts and gradually pushing the world toward its destruction. To face it, some humans having awakened various magical powers are fighting against this apocalypse.

Dora, one of them, has a special “Avatar” class which gives her access to all the other classes, at the cost of great difficulty to level them up. Despite his enormous potential, he chose to appear incompetent to get his team kicked, just so he could live a lazy life with his family, but his habit of fighting and beating the woman's brother the strongest in the Kingdom reveals her talents and she decides to enroll her in the royal academy.

Reluctant at first, his mother gives him the motivation he needs to pursue this past, but little did they know what kind of monster they threw to the world. Dora is not a hero wishing for peace, but a monster getting addicted to the taste of power, wealth, and freedom.

With his strange condition of being not one but many people inside one body, each with a different personality, but the same thirst for more, “they” use a strange system giving them a new vision of the world around them.

Dora pursues an unknown goal until he meets someone who knows more about his true nature than himself and sets him on a path that will nourish his eternal first, to the cost of his humanity, but in a world collapsing, isn't a monster the greatest weapon?

With many personalities in one body, each having a different relationship with different people, a system taking them further and further away from their humanity, and an increasingly hostile world where humans kill each other while monsters slaughter them, could the situation be worse?

Well, it looks like Dora isn't the only one with a system.

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“Why is the thing you summon always so strange, can’t it be a little more normal?”

Lu Yu looked helplessly at the guy who was waving his tentacles in front of him.

“Who made me look up to see you every day…”

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