Ruri's ranked 4th in the
second grade, not in the academy. I don't think there would be a cross grade ranking, because that doesn't make sense. Also we don't know about other grades. They exist, but no details were given so far. Ah, and for the second grade, the ranking currently looks like this:
- Chabatake Miku (Class 2-E, Guard Team Leader)
- Konno Aya (Class 2-A, Guard Team Leader)
- ??? (Guard Team Leader of either class 2-B or 2-C)
- Kurose Ruri (Class 2-D, Guard Team Leader)
- ??? (most likely the Guard Team Leader of the remaining class)
- ??? (probably a 2nd ranked girl in either class 2-B, 2-C or 2-D)
- Konno Hana (Class 2-A, Rank #2)
- ??? (probably a 2nd ranked girl in either class 2-B, 2-C or 2-D)
- Konoe Kanaria (Class 2-E, Rank #2)
- ??? (probably a 2nd or maybe 3rd ranked girl in either class 2-B, 2-C or 2-D)
- ??? (probably a 3rd or maybe 2nd ranked girl in either class 2-B, 2-C or 2-D)
- ??? (likely a 3rd ranked girl in either class 2-B, 2-C or 2-D)
- ??? (likely a 3rd ranked girl in either class 2-B, 2-C or 2-D)
- Natsuki Hinata (Class 2-E, Rank #3)
- Kakizaki Kaede (Class 2-A, Rank #3)
I made some assumptions here. Since the girls are ranked in class as well, the 3rd rank in the grade cannot be part of Class 2-D, because she would outrank Ruri who is #1 in her class. She has to be the leader of either Class 2-B or 2-C - which exactly won't be clear until the author reveals it somehow. But that much is safe to say. I have a gut feeling that it will be Class 2-B, but I cannot really give a reason for that. Doesn't matter at this point anyways.
From there onwards, it depends highly on who ranks 5th in the grade. That person could be Ruri's 2nd placed classmate, but that's not likely. She could also be in the same class as the grade's rank #3, but I will assume the grade's rank #5 is the leader of the remaining class - that makes the most sense.
Otherwise we might have a smart-ass class who's number 1 is rank #3 and the number two is ranks #5 and maybe 3rd placed one also ranking in the top 10 or something. Could be, why not... they could be even Class C - why you ask? Because their guy is a dropout and so they are not distracted by him anymore which allows for better class performance. On the other hand, not having a male student might have a negative effect on their grades. Too much is unclear at this point. And Class C is said to be troublesome, so it's not plausible for them to be a well performing class. That's also why I think the rank #3 is from 2-B. And if I look at the known positions, I assume pretty much evenly distributed rankings across the classes...
The 2nd place girls in each class must rank below their respective class leaders on the grade roster. We know the second and third ranked girls from 2-A and 2-E. And since the third placed ones hold ranks 14 (Hinata) and 15 (Kaede) that also excludes their classmates from the remaining ranks in the top 15 - 4th placed girls should rank lower than these two.
With both known 2nd place girls, Hana and Kanaria, on position 7 and 9 respectively it looks like the leaders are the top 5, their second in command ranks around 6-10 and the number three girls fill the remaining ranks 11-15. Probably... but I already said, some class might perform better or worse than this. It will be more clear once Ruri's classmates are revealed.
My guess, when I look at this, is Ruri's 2nd and 3rd placed classmates will be rank 8 or
10 for her number two and
12 or 13 for the 3rd placed girl in 2-D. But that's even more of a gut feeling. I could be completely wrong.