@Tcof: She's a high school student whose jaded view on life in general had driven her to, IIRC, skip school so much that the MC (who was working as a teacher at that school at the time) went up to her and convinced her to go back with a bit of sound arguments and her passive yuri-magnetness. Ever since then, she's been an infrequently recurring character who so far is the only girl that has not acted on her feelings towards MC, likely due to her personality being so subdued and "bah, too troublesome" (essentially she's very "lazy") that it greatly mitigates the strength of the attraction that MC induces in just every girl she meets.