甘やかしたりしないぞ！ ～小さくなって純情勝気な青葉お姉ちゃんに叱り可愛がられるツンデレ子作り～

His three lovely neighbors were like big sisters.
He longed to embrace them but couldn't say it, so the eldest slipped him a drug to relax.
The drug unexpectedly shrunk him from man to boy-size. Now he's cuter than ever!
Which of the sister should look after the reduced protagonist? He chooses the one
who runs hot and cold with kindness and fury, and his sweet babymaking life begins!