Daily Life of A Third Wheeler

"Being the Third Wheeler is no joke!' Mendou Kotaro is a third-wheeler of a certain eccentric relationship between both of his friends, Hoshoujo Yuna and Najimi Kai. Between the forbidden, innocent, and eccentric love that his friends, Hoshoujo Yuna and Najimi Kai have, Mendou was handed the responsibility, or rather the job of being the third wheeler to keep an eye out so both of them can continue going out until they decide to become public! Will Mendou Kotaro's life still become normal? Or was it never normal all along? A romance-comedy trope but with a twist of action!