Santa Catalina Gakuen

It was a sudden confession. Kento’s classmate Aoi was like an unattainable flower whom he could only watch from afar. Now, Aoi stood in front of him in the classroom at night. “I love you! Please go out with me!” He couldn’t imagine that it would finally be his turn to get a girlfriend. He was convinced that he wasn’t that popular and it must be a punishment game, he ran away in confusion.

The next morning, the principal made an abrupt revelation: the school was actually a boys’ school! The cute kouhai in his club. The pretty, but delinquent-like senpai. Yes, that ‘girl’ who confessed to him last night too. They’re all guys!

Prestigious all-girls school called Saint Orkis Academy was founded by the wealthy Azuma family. Although it was recently made co-educational, it still maintains its reputation as a top school. The academy is currently led by the daughter of the Azuma family's head. However, a new threat emerges in the form of the Nishiki family, a rising conglomerate that secretly trains and sells sex slaves to gain power and influence in the political and economic spheres. The Nishiki family sends a young and skilled female trainer named Kuga Kei to infiltrate the academy and take down the Azuma family. The Azuma family, unaware of his true identity, accepts him as a transfer student into the academy.

The protagonist, who loves boobs and bunny girls, is the head of the App Development Club. It has been secretly and casually developing a bishoujo game—an adult game—titled "Welcome to Impregnation Isekai Oppai Bunny Academy! (Tentative Title)" under the guise of a legitimate club activity. (Officially, the club pretends to be a wholesome extracurricular group, but in reality, it is nothing more than a "Bishoujo Game Development Club".) However, on Usaki Academy's parents' day event, while debugging the game, the protagonist is suddenly transported into the alternate world of the very erotic game he had been developing!

The world he was transported to was Yggdrasil, the world setting of the bishoujo game the club was developing. Every student, teacher, and even the school director had spectacularly huge breasts—and on top of that, they were all bunny girls! It was truly a bunny girl academy so stimulating that it made his lower half feel like hopping with excitement!

It was later revealed that his transportation to this world was actually a summoning performed by the academy. The protagonist was hailed as the Legendary Great Teacher, tasked with saving the school, which was on the verge of shutting down due to a decline in its low bunny deviation score. As the academy's director performed a skill search on him, at that moment—his 'Ultra-Lewd Education Skill' activated!

The director's erotic body was soon "educated” through sex! Success! In addition, it turns out that the semen ejaculated inside the director's body had also dramatically increased her bunny deviation and skill level! This will save the school from a low bunny deviation! As you look at the bunny students with huge breasts and their mothers, your lewd ambition grows even more in your lower body. With this dirty education skill power, can you conquer and sexually subjugate the school...... or even the other world entirely?

The protagonist's lower body is inflamed with ambition for perverse sexual uniforms and mother-daughter sexual relations in this otherworldly academy. "I'm going to give the students and mothers of this 'Oppai Bunny Academy' a perverted education!" Your ambition for oppai bunny girls begins now!

I'm getting slightly conflicting information about the plot of the VN Saint Dorei Gakuen. Some sources I've found seem to indicate that this is your classic corrupt school with a perverted teacher who kidnaps unwilling female students. If that is the case, hard pass on this title for me. Other sources seem to suggest that female students enrolled in this school knowingly and willingly, expecting to be trained into slaves, whether eagerly or reluctantly is another question. If this is the case, this title is just far enough from the norm that I might actually take a second look at it.
 
Does anybody know which is actually the truth of the matter?

https://vndb.org/v21529
We already have oppay academy but but there is a HD remaster plus out with all DLC's.