Sae is a college student with a crush on her cousin， Hasumi， who works as a researcher at the same college， and has been like an older brother to her． Despite her intentions to keep her feelings a secret， her body goes into heat， which is a phenomenon that was thought to have disappeared long ago． Even as a researcher in his thirties， Hasumi cannot think rationally in this situation． This is an omegaverse story about two people who love each other being brought together．