These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ho Yay: Kusakabe and Aoi, Luci and Ed. There's also Luci's habit of kissing Leon.
Les Yay: Even in spite of their later love rivalry, Masumi is very very admiring of Sayoko, and on one occasion even tells her how pretty she looks, before blushing furiously.
Masumi and Lilliana occasionally have their moments as well. At one point, the latter gives the former a peck on the cheek that makes her blush like crazy.