Nohara Kana's been a biology teacher at high school for 4 years, but 6 months ago she started coming to school with a letter of resignation in her purse every single day...One day, she happens to catch her new transfer student named Ohno sneaking a kiss in the corner of the biology lab with a girl from a different class. Kana scolds him, but he simply responds with, "I'm dropping out."Kana can't help but shout back at him in anger that she actually wants to quit as well!! ... then realizes what she just said and flees the scene, not noticing that her letter of resignation had fallen out of her bag...Later that night, Ohno shows up at Kana's house with the letter of resignation in hand, but demands that she let him stay at her place and that he'll go to school if she does... but also that he'll sue her for sexual harassment if she resigns?!And so begins our story of an overly serious lady teacher, a troubled student, and their dangerous new living situation!