Tsuna's Dying Will awakening on his forehead, entering him into Dying Will Mode
The Dying Will of a person is the person's most recent regret prior to being shot by the Dying Will Bullet. When shot by the bullet, it awakens the person's Dying Will and revives them, putting them in Dying Will Mode, or in some cases, Hyper Dying Will Mode. Whilst in either of those modes, the Dying Will of a person makes the person in the mode feel as if their body was breaking, yet makes them feel prepared to take on anything and to not be afraid of one's own body being destroyed.