When you are in a financial crisis, you apply for a job as a private teacher to get money for college, and finally a mother wants you to teach her twin daughters who are still in high school. The one with silver hair is called Lilika and the blonde one is Luluka

Lilika: Sensei, does sensei have a girlfriend? Luluka: Wow, Luluka also wants to know!! They both tease you they also very naughty when you teach them