For me, i makes sense but not for all volumes. Volumes 6-7-8 perfectly work with the letter in mind. Mei's sighs, Mei's sad or conflicted face when showered by Yuzu's affection ... It fits.
But volume 4 and 2, I don't many hints. Volume 3 can fit. Volume 1, meh. Mei wasn't even aware of the slight positive feeling for Yuzu who was just a nuisance to shut.