The World God Only Knows, Volume 9 (The World God Only Knows #77-86)

Nanaka wishes to defeat the only person who has ever won against her in Shogi, Tenri. In truth it was the goddess Diana, who was living inside of Tenri. The loss had created a gap in Nanaka's heart. Keima plans to have Nanaka win against Diana after days of training. After defeating the goddess, Nanaka's spirit is captured. The same night Keima captures Nanaka, Diana comes to his house to ask for help in finding her sisters, otherwise known as the Jupiter Sisters. Keima does not fully agree, but keeps it in mind as he goes to school the next day. The next day, he finds another spirit within a girl, Yui Goidō, who wishes to be free of her restrictive, rich life. Keima finds a solution quickly, but in the middle of the execution of his plan, he is obstructed by the spirit's power in Yui. Because of its power, Keima and Yui have switched bodies. How will the two cope with their new situation...?