Jealous
It was still the middle of the night, Yuna woke up and looked out the window of their room which was a super-wide glass and was above, really so high that she could freely see anything in the city. A hot air balloon, or whether it was a giant lantern was flown. It was shaped like a heart and Yuna looked at it helplessly for a long time, she was still very weak and sick from their activities earlier. He kept staring at the balloon for a long time, there was a sense of awe there. Come on, Yuna is also a woman and likes things like this.