Oshiego ni Kyouhaku Sareru no wa Hanzai desu ka?

Tenjin is a 27-year-old teacher at a cram school helping students prepare for middle and high school entrance exams. Though skilled with elementary students, he has no affection for children and approaches his work with indifference, mentoring a colleague while enduring life's hardships. During a class, a fifth grader unexpectedly hugs him and says she loves him. A 14-year-old student named Seika witnesses the moment and uses it to pressure Tenjin into providing private lessons for her at night.