Motto! Haramase! Honoo no Oppai Isekai Oppai Spy Gakuen!

The protagonist had two secrets:One was that he was an extreme boob lover, and the other was that he is actually a descendant of ninjas. One day, when he opened an old scroll left behind by his late father, he was transported to another world along with his step-sister (who has massive boobs) and his step-mother (also massive boobs)! He ended up in a dream-like “Boob Spy Academy” where everyone, from students and teachers to even the school’s principal, was a spy and had massive boobs! The Spy Academy was divided into three classes based on individual skills, and the students spent their days training hard and competing against one another. After falling into the dormitory bath, the protagonist found himself in a real bind, chased around by the busty spy students (who were completely naked). Just as he thought he was saved by the principal’s arrival, he was immediately assigned a certain “mission.” "Could you please track down the enemy spy who has infiltrated this Spy Academy?" It turns out an enemy spy has infiltrated the academy, and the principal was at a loss. Apparently, the boy who came from another world possesses special skills and is destined to save the academy from this crisis. At that moment, the “Perverted Mission Skill” activates! A mission that makes the principal go wild is triggered! After the protagonist successfully completes the perverted mission, the principal becomes convinced that he is the academy’s savior. Using this skill, he must conduct a lewd investigation of the busty spy students who wield influence over the academy, and their mothers! The busty spies he targets aren’t easy to deal with; they’re after the information the protagonist brought from another world. A lewd espionage battle against these busty spies, each with their own quirks, and the honey traps that come at him! Use your super-lewd mission skills to track down enemy spies and, at the same time, subjugate the Spy Academy with lewdness! "I’m gonna use my lewd skills to investigate the busty spy students and their moms, and strip them naked!" The protagonist’s cock-tastic mission, undertaken as a secret assignment, is about to begin! [Translated from the official website]