Did Wataru's intentions slip by Aika because she was getting impatient?! This is the start of a romcom revolving around two people who just can't get their feelings across and both think their love is unrequited!
Recommendations:
A Couple of Cuckoos カッコウの許嫁
Reborn as a Vending Machine, I Now Wander the Dungeon 自動販売機に生まれ変わった俺は迷宮を彷徨う