Underrated ship. Umi is so rigid and button-down when it comes to respecting traditional roles ... and gets so easily flustered, too. And she looks up to Eli. She'd be at her mercy as long as Eli didn't step too far out of line.
^ That one seems more like popular athletic girl on awkward tomboy. Also, tomboy appears to be the pursuer there; popular girl is at least playing hard to get. Same artist, though, so this is likely inspired by that.
Sumire's outfit looks so good on her. Usually it's Keke sporting the open shoulder look with the ruffle draping and it's extremely cute. Don't know why she's dressed like a poodle here, but I suppose it suits her ok.