Recently, Mutsuki-chan has been showing up whenever Sensei is busy. While she's there, she has been pulling off naughty pranks. She gives "suggestive" massages, takes baths together... Her teasing has been getting more intense and finally, it escalated to the nap room... But there’s a certain reason behind Mutsuki-chan’s mischief that she can’t tell Sensei... Though she loves to tease, Mutsuki-chan is filled with warmth, kindness, and a nurturing side—so please show her lots of affection!