Natural is better.
Chiaki is wavering inn our hearts as MLI, because she is not progressive enough. We all know, he likes hypno-girl's outside the best. Chiaki's biggest advantage is, that they are closer, as they act more familiar with each over, but soon it is last halt "Friendship City" for her. Her chances have been the best in the beginning, while being at a good level of being familiar with each other. But the other girls also entered that proximity and she is entering family-grade familiarity. He never really saw a chance of a romantic relationship with her, so soon it will be a scenario´far too wild to start imagine it for him.