Kaiki! Drill Otoko no Kyoufu

Hasegawa Nozuomu, the main character, will come to Shiraki Gakuen as a new teacher. After being appointed, the hero is told from the principle, "Our students are all special people and shouldn't interfere or hold them back" Nozuomu not completely understanding cryptic message soon finds out how special and different students are at academy.

Protagonist Shun was a 2nd year student. He was an average teenage boy, still not interested in girls. Everything changed with the arrival of transfer student Ei.

One day Shun followed Ei to a remote part of the school he never knew about, an underground passage. Ei disappeared inside, then appeared in front of Shun wearing girls clothes.

This was a feast, an orgy of all male students dressed as charming girls. As the perversion unfurled before his eyes, Shun felt his own lust stir...

When the part was over Shun stood alone, sighing in the night that would never feel normal again. His head still spun from what he had experienced.
Guided by Ei's hentai hand, confused about his own aroused feelings, Shun didn't know what to do. The next day he had to talk with Ei. School could wait.

It’s been a few years since I left my hometown where I was born and raised due to my father’s work.
Waiting for the protagonist, who returned to the town where he was born and raised, was his childhood friend Miyuki, who changed from a boy to a daughter.
Miyuki, who used to call him “Nini” and looked up to him, wondered where and how he went wrong, and now calls him Zako.
Surprised, but when the main character tells him not to call him Zako, Miyuki smiles mischievously and lustfully, telling him to try to make him do that.
For the time being, sleep there――
The main character is puzzled by Miyuki’s words and expects.
Miyuki smiled as if she saw through it and put her face to his crotch.

The protagonist, Kazama Yukiya, was living a student life while earning money through his own method of exorcism and purification, in addition to receiving financial support from his parents. One day, men in black suits appeared at his place and forcibly took him back to the countryside. They were the messengers of the "main family", and Yukiya is informed by the head of the Kazama family at the mansion where he was taken that Hisame, a shrine priest he had adored like a real brother since he was young, has passed away.
Astonished, Yukiya is immediately told by the family head, "Become the shrine chief to protect the company and take on 'a certain troublesome matter' with the shrine maidens. You have the talent for it." Confused, Yukiya hears about the "troublesome matter" from the three charming shrine maidens and reluctantly accepts the task.

The protagonist dies in a car accident and reincarnates as a god in a world entirely devoid of women, inhabited only by crossdressing boys (otokonoko). Furthermore, in this world, he is the only being who possesses the divine power to get them pregnant!
After successfully impregnating the three shrine maidens serving him—Hahamu, Mamamu, and Kokomu—the protagonist eagerly awaits the arrival of his children. One day, however, he discovers a mysterious crystal ball hidden deep within the temple.
As he wonders what it could be, the crystal ball suddenly emits a dazzling light. When the light finally subsides, everything appears completely unchanged at first glance.
However, as he questions what just happened, he notices that the temple has somehow become aged, weathered, and covered in filth. In a panic, he calls out to Hahamu and the others.
But instead of his familiars, three completely unknown crossdressing boys appear before him, claiming to be shrine maidens. They deliver a shocking revelation: this world is now on the brink of ruin.
What exactly happened to the protagonist’s reality? And will he be able to fulfill his duty as a god to save this dying world?