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.”