Hiro Kuroda is a boy who worries about his small body but hates the taste of milk. One day, he inadvertently summons a cowgirl named Bell from another world through a strange application on his smartphone. Bell soon starts to work as a farmer in Hiro’s world while building a strong friendship with her summoner. Noticing that her summoner strongly dislikes milk despite his desire to grow taller, Bell offers him a kind that she knows he will love and help him grow.