Where To Start... The beggining, Of Course!

Rin and Miku are complete strangers when they find their boyfriends cheating on them. Once they break it off, they both flee to the deserted park for comfort. When they get up to leave, they accidentally run int each other, literally!! They become best friends, and both have musical talent. So they decide to do their best to get discovered, and on that path to discovery, they end up meeting Luka Megurine, a girl with long pink hair and was in the same situation. She joins them on their climb to stardom!
Meanwhile, the guys are devistated and regretfull. When they meet, they decide it's time to get their girls back. What will happen? Where will they find them? Why do I suck at summaries? Who knows?