(Bloomberg) -- US insurer Aflac Inc. on Thursday sold a yen bond totaling ¥65.9 billion ($415 million) across four tranches, joining a wave of foreign issuers tapping Japan’s credit market.Most Read from BloombergSpot the Difference: Putin Gets Trump Treatment From Xi in ChinaIran Threatens to Retaliate Beyond Middle East If US AttacksSpaceX Filing Reveals $4.28 Billion Loss, Musk’s Tight GripHasbro Cancels Dungeons & Dragons Game From ‘Star Wars’ VeteranUS Lawmakers Plan New $130 Fee for Electr