Oshiete Sensei Otoko no Ko Gakuen ~Icha Love! Otoko no Ko Triangle~

Suddenly, my father decided to remarry.

As a result, I suddenly had four voluptuous older sisters in my life, with two step sisters in addition to the two blood-related sisters I already had... *sweat sweat sweat*

And one of those step sisters was a senpai I had a crush on in high school... And her older sister I had also done a lot of things with before we knew things would turn out like this...

Why is the world so small? *sweat sweat*

Before I knew it, we were living under the same roof, and my summer was engulfed by a tsunami of spicy, steamy, erotic daily happenings.

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.

You’re a 21-year-old medical student struggling to focus. No matter how hard you try, you're unable to concentrate on your studies.
Desperate for help, you ask your intimidating professor Shizuka for guidance, and she writes a custom essay specifically for you after you promise that you'll study and take your education seriously—but the very next day, she catches you slacking off at the newly opened waterpark. Infuriated, she decides to punish you.
Experience a day of being punished by Shizuka, your 199-cm-tall, no-nonsense, super-strict sensei.

The protagonist is a new teacher who has just graduated from graduate school and started working at a rural school.
It's a very sparsely populated area with a small number of students, all girls... Despite being a virgin and having never had a girlfriend, the protagonist manages to build good relationships with his students.
Then, he learns that the school has an aptitude test for new male teachers.
The shocking content of the test is that it tests their ability to resist temptations from the students…

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!