Owww, three of them were reallly cute
Sumire liked Kenta cause Kenta kind of giving what she wanted from her bottom heart (like that ice cream, it's a little push but that push made them happy), Kenta liked Kiyo because she's an earnest girl that often think about other (such as grandma and Su), a selfless person. And... I think Su was a special person for Kiyo because it's like most of time she thought about Su and pretty attentive toward her, compare to others (in maiko house and Kenta)
The best part, they're friends and no hard feeling toward each other cause they know the other party just as precious as best friend :3