I've replayed Tachibana's route, and yes, the second keyword is easy to miss. You have to choose one of the non-ding answers during the trip in August. Oh, and I added the locations of the keywords in my post, too, so you can check exactly where the second keyword is.I was missing the second password judging by the order you placed them. (don't know how I missed it yet).
And yes I'd be really happy if you posted where/when you got them,please!
@[member='Kuroko Shirai']: You don't really get a boyfriend until the game of the game if you played someone's route correctly. But yeah, try to get someone to at least green by July 1, orange by September and maybe pink by November. Dating every weekend/holiday is a bit extreme, but it works if you can also raise you raise your stats and lose weight quickly.