Sawada Tsunayoshi - the soon to be Vongola Decimo - is being bullied by his classmate everyday. He is actually able to protect himself but never do so. Why? Because he is known as dame and useless person. If he want, he can drop the mask, reveal his true self. But by doing so, it will increase the posibility of the enemy mafia found out his whereabout and targeting his classmate. The truth, it hurts, he is hurt. But again, he will hide it from his true friend. He don't want to make them worry. He don't want to see sadness in his friend's face nor his classmate, though his classmate don't deserve it. Unaware that his true friends and guardians notice it. Finally, when they can't hold it anymore, they start to get revenge for him. They won't let their friend, their Boss, their Sky to be hurt anymore.