Answer: 634-5182-8888-555-3923-57339
Why:
The bolded words send off a hint along with the location of where Miku was. The Musahi providence is located in Japan. Connecting the ideas of Japan and the words would equal to the answer. That is proven true due to Japanese wordplay. Japanese wordplay are homophonous words associated with a given series of letters, numbers or symbols, in order to associate a new meaning with that series. The new words can be used to express a superstition about certain letters or numbers.
Musahi: Mu-sa-hi: 634
Coffee: Kō-hi: 51
Hearts: Ha-tsu: 82
Ha ha ha ha: 8888
Go, go, go: Gou-gou-gou: 555
Thank you: San-kyu: 39
Nissan: No-san: 23
Konami: Ko-na-mi: 573
Miku: Mi-Ku: 39
