A small high school girl's nemesis is a recluse?! It's been 10 days since high school girl Koi and Nozomi, who have shrunk to a height of 12cm, have been staying in the storage room of the recluse Ookubo Yume's house. With the help of Nakano Nae, who is in the same predicament, Nozomi heads to the shrine on the back mountain where she first opened her eyes to find out the cause of their shrinking...?! A palm-sized high school girl x a recluse living under one roof in a daily adventure!