I see Rin's birthday is listed as 8/17. I'm just wondering what the source for that is. In chapter 31 of the manga she celebrates her 10th birthday. This chapter seems to take place during the second school trimester after summer break which would put her birthday sometime in september or october. Aoki and Houin are seen wearing sweaters in this chapter, another indication that Rin's birthday is in the fall not summer.