My Invincible Vitality

Tagami is an ordinary businessman, but he has a secret hobby of watching men's muscles. He is a serious maniac. One day, when he has been too busy to do any muscle-watching activities for days and is naturally frustrated, Naito, one of his colleagues speaks to him. Naito has a muscular build. But Tagami feels extreme jealous for him as he is good at work and everyone likes him. So, he tries to give him the cold shoulder, though he can not look away from Naito's sexy body. And the sudden happening makes Naito's muscles exposed! Tagami feels lucky to see the muscles but the truth is... Guys' hilarious love story entangled with Tagami's muscle maniac friend, Boshiyama and his colleague, Hayashi (who is also well-muscled). Do their one-sided muscle loves reach other guys?