A romantic comedy about the forbidden love between a killer and his target. Nakagawa Daishi plays a powerful killer who always makes mistakes at critical moments. The protagonist, Hiiragi Otora, played by Nakagawa Daishi, is a pure young man with a sweet appearance and superb motor nerves. After his biological parents died at the age of 5, he was raised by his father's friend, Otora Joichiro, but Joichiro is actually a legendary killer with the nickname "Five Yellow Tigers". Once, Hiiragi learned of Joichiro's true identity because he was killed, and in order to avenge him, he decided to become a killer himself. After being well prepared, Hiiragi, who is impeccable in terms of his physical ability as a killer, approaches the assassination target, Mitsuki Narumiya, but his bad luck makes him unable to kill the target no matter what, and he has saved Mitsuki Narumiya many times. Hiiragi is entangled in the gap between the desire to kill and the budding love.