The icon doesn't necessary mean anything, it could be a group story like "Battle under the blazing sun" or "Udon".
You can hear some voice samples on the anime website, there're talks about Yuuna massaging Fuu, and Tougou wants to be massaged by her.
If you think about it, the actual OTP of the show is YuunaKarin. It's Karin who gives Yuuna strength in her moment of weakness after all. YuunaTougou was a decoy pairing. Everything about Tougou is fake, even her supposed role as MC of the light novel.
Out of the 3 stories in the demo, 2 are in third person, only "Udon" is told in Yuuna's POV and even then, it's still mostly driven by dialoges.
From left to right, up to down.
>Battle under the blazing sun
>Inubouzaki Fuu's daily life
>Overcome your weakness
>God hand Yuuna