|“||Even if you are a Shinigami, in the end...you are only a child...||”|
—Mosquito, Chapter 53
Nightmare Noise (夏夜ノ羽音 Naitomea Noizu in Japanese, literally translating into Buzz of a Summer's Night) can only be used by Mosquito whilst he is in his Form from 400 years ago. The attack itself launches a significant number of the bats that now compose his body, while still retaining his human form, at his opponent. The speed at which these bats obtain while sent and their sheer number, result in tearing and ripping the opponent apart as they make contact with the bats razor-like shape.
Due to the vast number of these bats Mosquito has in reserve, he has been seen to be able to alter the composition of this attack to either spread the various bats to assault the opponent from all sides, or to send them in a more concentrated straight line.
He uses this attack in the fight against Kid. As a Shinigami, Kid manages to survive one of these attacks despite being wounded, and later manages to block this dangerous attack using Death Arm Blocking.