A Chinese national was arrested Tuesday for allegedly scamming a 71-year-old woman in eastern Japan out of 809 million yen ($5.3 million), in what marks the largest reported loss in a social media-based investment scam in Japan, police said Tuesday. The woman, a company executive from Ibaraki Prefecture, was lured into an investment scheme through a fake Line messaging app account impersonating Japanese economic analyst Takuro Morinaga, according to the police, who have arrested 34-year-old Wen Zhuolin on suspicion of fraud. Police believe Wen, a self-professed company executive residing in To…