Hello. This manga is yuri, or shoujo ai, and it is about two girls. It starts out with them in a class room and a lizard wonders through a window. One girl compares herself to the lizard, saying she is gross and not liked. She drew a line that she cant cross, because she has feelings for a class mate, also a girl. The girl she likes gets the lizard and a guy from the horticulture club comes and gets it.
I think it is kind of long, a series.
Thanks in advance

Moved to Yaoi/Yuri.