This story lets us look into the relationship of Matsuda Otome (a home schooled girl) and Nakagawa Minato (a high school teacher). Otome has been through a difficult past and is now under the care of Minato-sensei. Otome becomes suspicious of Minato's day-to-day routines and investigates. What will Minato tell Otome when she confronts her?

Each volume contains one kakioroshi chapter.
Volume 3 contains the side story "My First Hoshikawa" (マイファースト星川).
Chapter 20 is split into part A and B. --counted as two.