One Piece: Admiral Mentor, Tutoring the Empress After Class

[Decisive and ruthless + crushing Celestial Dragons and Momonosuke + Empress as the main wife + invincible + multiple female leads]

Su Chen transmigrates into the world of the Pirate King and becomes a Marines instructor.

Fierce Sea Kings, cruel pirates, and Celestial Dragons who act like anything but humans.

To survive in this dangerous world, Su Chen uses his awakened Mentor System to increase his strength.

"First successful lesson, grade A: acquired mastery of the Six Powers."

"Ding! Successfully helped Zephyr understand what true justice is: acquired a powerful Devil Fruit!"

"Successfully helped the Empress understand a woman's allure: acquired the Empress's maximum loyalty!"

"Successfully helped Aokiji understand his purpose in life: acquired a Great Grade Sword!"

After defecting, Su Chen starts from Amazon Lily and has students all over the world.

Years later, seeing his students diligently training, Su Chen is deeply gratified.

The stronger his students become, the stronger he gets!

Zephyr says, "I reflect on myself three times a day. Sure enough, Su Chen really is the best teacher!"

When the Four Emperors and the Three Admirals meet again: "What? You're Su Chen's student? What a coincidence, so am I!"

When Im realizes that Su Chen will become a major threat, she discovers that even her Holy Knights have defected!

I, Su Chen, conquered the world after giving a few casual lessons.

(To avoid spoilers, the rewards in the blurb and the plot may be changed.)

(The pace is slower in the first few chapters. The story officially gets going once it reaches Amazon Lily!)