kageyama tobio, a high school student... he lived on his own in a rented house near the school... his family sometimes helped him pay the rent and often went to visit him... the rest of the time, kageyama spent studying, playing volleyball and hanging out with his friends...

that until he decided to adopt a little dog. he named it hinata... every day he took him out for walks, they spent a lot of time together and sometimes he made him sleep on his bed... that is until something unexpected happened. hinata was no longer a dog.