No way. It's Yumi. Kan-chan was mostly the seme but they reversed too, it's hinted in Azami.
No it's definitely Yumi, I think that picture shows up in Yumi's story several times too (and in Azami I think).
The one in the picture with Kan-chan is Yumi but Natsuo was also their friend in high school too.. so yeah... ^^
I hope they're still friends.... and have a reunion ٩(๑❛ᴗ❛๑)۶
I've always thought the guy with kan-chan in that pic is yumi... is that actually natsuo??