@BCS you forget that Takashi's 10 years older than her. She needs to be at least 16(or 18 idek) to legally enter a romantic relationship with him, preferably 20s cause then it won't be looked down upon by society.
@BCS It's not that you need to be 20 to enter a romantic relationship. It's that she's 9 and Takashi is 20 so for it to be acceptable, she would have to wait until she's of adult age.