Kodai Shoujo Doguchan

Japanese Title: 古代少女ドグちゃん

English Title: The Ancient Dogoo Girl

Plot
By chance, a hikikomori named Makoto Sugihara finds a strange breastplate buried in the woods. When he places his palm on the breast plate, its design gets burned into his palm while the action awakens a girl named Dogu-chan, a hyperactive yōkai hunter from the Jōmon period with large breasts. Because he had touched her breastplate, Makoto is now bound to Dogu-chan as she adapts to modern day life, fighting yōkai in magic armor formed by her dogū assistant Dokigoro while slowly prying Makoto out of his shell as he is dragged into her misadventures, whether he likes it or not.

In the sequel, a college student named Shouta Tsuikimiya moves into the house where his archaeologist father, Yuzo, had last been living when he disappeared. Shouta inadvertently awakens Doji-chan, a novice yōkai hunter, when he finds her breastplate half-buried in the garden of the house. As if juggling his classes with dealing with the clingy and doting Doji-chan were not enough, Shouta soon finds that Doji-chan's fellow apprentices, as well as their mentor (Dogu-chan from the previous series), have taken up residence in his house as well.