At one point, Chidori catches Odagiri none-too-subtly coming on to Nanoka and whacks him upside the head with her purse, sending his glasses flying and leaving him helplessly floundering and groping around on the floor for them.
Odagiri: My glasses...! My glasses...!
The point at which Nanoka gets to chattering a bit too freely about her big brother to a boy while helping him store some equipment, and he rather casually says "So it's true what they say: you really do have a brother complex." A cloud (of steam?) forms up over her head, and pops like a balloon.