Kami nomi zo Shiru Sekai

Synopsis

Keima is dismayed upon learning from Elsie that there are many more runaway spirits within the city. After meeting Mari Katsuragi, Keima’s mother, Elsie claims to be her “husband’s illegitimate daughter”, though this causes Mari to snap during a phone conversation with her husband for his “infidelity”. Keima refuses to accept Elsie as his little sister, since she does not fit the criteria in his view. However, upon hearing her story on wanting to be successful just like her older sister, Keima reluctantly accepts Elsie as his sister

During lunch at a popular food stall, Keima and Elsie find their next target, Mio Aoyama, a rich girl who proceeds to buy all of the yakisoba sandwiches. Keima believes she is an easy target as she has all the characteristics of a tsundere, and a love confession might break her hard shell. Unfortunately, the confession does not work as planned, and Mio has her chauffeur beat Keima. As Keima and Elsie follow Mio to her home, they are surprised to learn Mio lives in a shabby apartment

(Source: Wikipedia)