Protagonist Tsujikaze Touya opens an old scroll left by his late father and suddenly finds himself, his step-sister, and step-mother pulled into another world. They arrive at a specialized Spy Academy divided into three skill-based classes, filled exclusively with enormous-breasted spies. After an accidental fall into the dormitory bath leaves him chased by naked students, the principal assigns him a critical secret mission that activates his unique lewd powers.
Isekai Transfer and Spy Academy Life
1. Experience an abrupt shift from ordinary life into a fantasy academy where espionage training and massive breasts define every aspect of daily routine.
2. Navigate three distinct classes of spy students who compete fiercely while the protagonist balances his dual identity as ninja heir and extreme breast enthusiast.
3. Shared living with the step-sister and step-mother creates constant family-oriented tension and opportunity amid the academy’s competitive environment.
Lewd Mission Skills and Investigation Gameplay
1. Activate special “Dosukebi Mission Skills” that turn ordinary investigations into highly erotic encounters designed to expose secrets and weaken resistance.
2. Track down an infiltrating enemy spy by using these powers on students and staff, blending stealth, interrogation, and impregnation mechanics.
3. Successful missions simultaneously advance the plot and expand the protagonist’s influence over the academy’s busty population.
Massive Breast Focus and Mother-Daughter Content
1. Every female character features exaggerated proportions and detailed interactions centered on breast play, honey traps, and impregnation themes.
2. The inclusion of both young spies and their equally endowed mothers delivers classic series-style dual-generation harem progression.
3. High-quality Live Ero Animation and full female voice acting bring the abundant scenes to life with dynamic movement and uncensored dirty talk.
Signature Series Impregnation Conquest Experience
1. Motto! Haramase! Honoo no Oppai Isekai Oppai Spy Gakuen! continues the beloved franchise tradition of isekai academy settings packed with extreme breast fetish content.
2. The combination of ninja heritage, spy intrigue, and a world full of willing or seducible massive-breasted women creates endless opportunities for conquest.
3. With over 140 base event CGs plus extensive variations, this title offers a complete, high-volume journey of investigation, seduction, and total academy domination through impregnation.
