Story
The latest series from Shirow Shiratori, the author of “No-Rin”! A comedy about a live-in apprentice who won't take “no” for an answer and the most intense Shogi matches this century has seen, all supervised by “Saiyuki”, Osaka's young professional Shogi team!!

I open my front door, and there's a grade school girl sitting there--.
“I'm here to be your apprentice, as you promised!”
Claiming the Shogi World's strongest title, “Ryuo”, at the age of 16, Yaichi Kuzuryu comes home to find, Ai Hinatsuru, a 3rd grade girl waiting for him. A nine-year-old.
“Come again? ...... Apprentice? Huh?“
“...... Don't you remember?”
He did not, but that's how the two came to share the same roof. Yaichi's spirit was on the verge of breaking, but Ai's unyielding enthusiasm reignites the fire within him--.

(Source: BookWalker)