Ayako, an ordinary lady who works at an office, finds herself in an unrequited love with yuto, her senior in the company. He's done nothing but take care of her and look after her. So, hoping to return the favor, she announces she would be yamatos, Yuto's liitle brother, homeschool teacher. She's excited to go to Yuto's house, but finds the pretty faced yamato saying some terrible things to her. " youre terrible at kissing... Or is that just an act to instigate me? " she knows that she shouldn't be doing this, but she feels as if she's sinking into those deep blue eyes of his....