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Time to come right out and say it. I can't stand Takagi. She doesn't act like someone her age. Her level of emotional maturity is considerably beyond her age.
With that in mind: the relationship depicts her grooming him. They aged down an adult and are having her groom a child.
Just a reminder that Uruka was the best route and the true ending.
Summarizing every childhood friend in a harem manga in only two panels.