Synopsis: Child X Adult Equation

Single father Nanjou is raising his son, Chiharu, on his own. Aiba, one of Chiharu's teachers at the daycare center, often stays late at the Nanjou household to care for the child, gradually taking on a maternal role. What will happen in the relationship between Nanjou and Aiba? As time passes, Chiharu forms a friendship with Satoshi, another child from the daycare. However, their friendship is put to the test when Chiharu's feelings for Satoshi remain unrequited. How will this affect their relationship? Bonus one-shot story: "Otome Danshi no Houkago Lesson" (Girlish Boys' After School Lesson)