Harumi is more in the shoes of a friend relegated in the background cause her best friend found her love of her life and has set new priorities and goals. Harumi is more like someone who feels to be a third wheel, she supports Yuzu but at the same time, seeing the couple's interaction, she doesn't want to intrude. And at the same time, she wants her time with Yuzu back as it was before.
Yuzu directly come back home now ... so I don't see any romantic feelings especially since this chapter is before Mei's real confession and the wedding's preparations.
Haru is just distressed and probably lonely now that her best friend is into another galaxy. She wants to inderstand and grieves her complicity with Yuzu that Mei shattered in a sense, and the more Mei will be open and less "robotic" as some people here say, the more Harumi will feel forgotten.
The romantic possibility was already shut down with the end of the main story, and seeing a happy Harumi at the wedding doesn't really point toward any drama about that. I guess we'll probably have more insight into Harumi's inner turmoil soon, and her lonely way to deal with these issues will probably be covered.
After all, she doesn't want to bother Yuzu about that, but doesn't really want to confide into Matsuri either.
last edited at Feb 19, 2019 2:03PM