Library Domestic mystery Botchan's ransom

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Domestic Mysteries
『 This Miss 』 Grand Prize Series / The 21 st 『 This Mystery is Amazing! 』 Grand Prize Hidden Tamatsukuri Item. Evening Kouko, a non-regular Japanese teacher, finds a memo with a code on it on the desk of a Chinese exchange student, commonly known as Botchan, and takes a screen capture during an online lesson. His boyfriend Keiji, who is a freeter, says it may be a password for a net bank, so he tries to log in. He has a balance of 300,000,000 yen. They both succeed in stealing 300000 yen, thinking that they wouldn't be able to find out even if they withdrew a little. But a few days later, he received 300,000,000 yen in cash in the evening Kouko's room. Then he received an e-mail from Botchan saying, "Give me back my money." In the e-mail that continued to say, "If you don't give it back, I will kill the woman." In the e-mail that continued to say, "If you don't give it back, I will kill the woman." Evening Kouko hastened to find out that Botchan did, but I have no idea what he meant by sending me the money. Can the Japanese non-regular and freeter group steal 300,000,000 yen from the Chinese millionaire?