Ambiguous ending is still ambiguous I see.
As much as I wanted to hold out for the two figuring things out, am going to call it (for myself) that Nagai's love for Hinohara has withered on the vine, and translated into respect and gratitude. Mutual unrequited love unfulfilled.
At least he got to give her a kiss on the cheek in the original.
In a way the two teachers unrequited loves are fitting bookends to many of the other characters, sandwiching all their loves and dramas right in between.
