Tonio Manga features story and art by Shinnosuke Saika and is the fourth volume in the Sleepy Child Series.

You are you Tonio. All of your father, and all of your mother too. This is the story of Tonio, from before they met Mato in That Child.

Note: Tonio does not require previous knowledge of the events of Sleepy Child, That Child, or The Lullaby.