Shioda Nagisa's Box Weapon

Everyone in the world knows that there is an organization in the world called Vongola. Everyone knows that Vongola has a department called Varian. Everyone knows that Varian has a cloud guard named Shiota Nagisa. Everyone knows that Nagisa Shioda has a box of weapons called Koro-sensei. This box weapon is a yellow octopus, wearing a doctor's suit, likes sex, and likes to make nulufufufu honey laughter. Nulufufufu~~~~~ CP is undecided, it depends on the situation. The setting is that when Nagisa Shioda grew up, he became a killer and joined Varian. With the help of Verdi and others, he successfully created Korosensei and began to live a life of mischief.