Hachi is a dog very loyal to his master, despite all his misadventures, Hachi will always be with him even in the most difficult moments, fulfilling all the orders of his dear master.
On one of his morning walks with his master, they meet a cute girl who hugs Hachi. In his thoughts, his owner wishes to have a girl like that by his side, at that moment, Hachi bites the young lady and they both switch bodies.
Now his owner must take care of Hachi with his new female body.