If you're looking for manga similar to Tenshi no Omega no Teku ni Byousatsu Sareta Kekka, you might like these titles.
One day, science-loving wallflower Shikito Takai smells an overwhelmingly alluring scent coming from his classmate Kaito Nishio, whom he’s always admired. Then, when Nishio becomes flushed and weak during gym class, Shikito tries to take him to the Nurse’s office, but the two somehow end up in the disused equipment storeroom...
After causing a certain problem, Haruto transfers from an elite alpha school to a regular school. In the classroom filled with excitement over the out-of-season transfer, he meets the student council president, Miyabi, who, for some reason, is the only one who treats him harshly. They have totally opposite personalities and circumstances, and, even though they reject each other, they also feel strong attraction. They gradually delve deep into each other’s hearts. But Miyabi’s body, unable to resist Haruto’s pheromones, soon becomes uncontrollable… Immature, painful, and fragile – the beautiful days of youth.