So when are we going to get to the jealous girl causing some big incident, being forgiven, and them becoming best friends? That is where its going right?
I'm unsure... but I'm 90% sure that new slime is going to be at the center of it all.
Note that Rain (the jealous girl) was more proud of killing harmless slimes than befriending them... Esmeralda (the elderly teacher) wanted to teach a lesson about the
weight being alive and taking a life, not abusing/exerting power over the helpless. What Lily did instead was remind Esmeralda that there are times when one can simply appreciate being alive and sharing its joy.
I'm actually more concerned that Rain's first act was to
kill rather than observe the slimes. Esmeralda wanted to teach a lesson in "adventure", not score-keeping kills for the sake of "sport". The way Rain went about killing the slimes as an experiment for her magic is a sign of a potential psychopath right there. I can't see Rain's senseless killings going over well with Esmeralda had she revealed them because she basically toyed with other lives for her amusement.
Edit: went back to find the characters' names