The ending, I believe was done in that way to show that she is trying to relax her mind by doing activities like this.
But it feels so comedic to focus on that out of nowhere 😂
What's also messed up is that Amano was actually able to correctly infer the full version of Manabu's confession while also thinking that all their time together means nothing and they shouldn't be with each other if they don't end up going to Tokyo.