do you mean her 'little' sister Fubuki? Check out the S2 OVAs, 2 subbed so far!
Nice MC setup... I do wonder if the greenhaired girl is potential girlfriend material? the love you/hate you type... can't remember the name of that trope either... but this MC seems more original, so unlike American fake superhero crap..... really nice... fresh or so it seems to me. I'll have to see if S2 is eng dubbed and available...
Hopefully better than season 3: 3. Shokugeki no Sōma Shin no Sara (finally) ^^
4. Sword Art 0nline Alicization War of Underworld (no Kirito as MC but Alice)