Ouendan 2

I love my DS. I love quirky cute games. While I do not own the game about touching schoolgirls in inappropriate ways I do have Ouendan 1 and 2, as well as the more English-familiar Elite Beat Agents

I haven't completed Ouendan 2 yet, and am still quite confused about what's going on in some of the storylines. What's with the old man and the animals and the oni? What exactly is the relationship between the two choirgirls? Are they lesbians? Or was the rose just because sempai is overly melodramatic? Was she threatening to jump off the balcony in the beginning because choir was being canceled? Or what?

This is the problem with not being able to read Japanese.