A Tropical Fish Yearns for Snow Vol. 6 (manga)

Koyuki and Konatsu have both started to see the other as important, but they're still unable to be honest about their feelings. This leads to frustrating days when they're never in sync, and they begin to drift apart. Then one day Konatsu sees Koyuki and her classmate Kaede spending time together as if they're the best of friends, and she can't contain her agitation. Konatsu and Koyuki feel so strongly about each other that they feel uneasy even when there's nothing to worry about.