I met a* half-Japanse girl in a* shop.

I met a* half-Japanse girl yesterday.
I went to a Turkish shop with my friend to get something for our breakfast in the morning.
When we were choosing what we wanted* to buy, one girl tried to pass by behind us and she said "Sumimasen." We were surprised by what did she said because she said "Excuse me" in Japanese! Then, too, She* looked like a European. We didn't expect that it when she spoke Japanese;* so, I couldn't resist asking to her, "Do you speak Japanese?". And Then she said, "Yes, I'm mixed with Italian and Japanese". From what she said, when she went* into the shop, she heard our* Japanese conversation from us, so she tried to say something in Japanese.
After that, we chatted with her for a* couple of minutes. She just arrived here last week from Germany and she is going to live London for couple of years* to sing song. We promised to meet again and got back our then we went home.
This experience was so amazing and a miracle. If we wouldn't had went didn't go to the shop in the morning, we wouldn't have met her.
I think this is London. We can never expect that what is going on with us. (will happen to us or may happen to us)

Some minor corrections but, Great Job!