The amanojaku is a nasty Japanese beastie that predates Buddhism, might have originated from a Shinto deity, who you can usually find getting trampled on by the Four Heavenly Kings at temples all around Japan. It’s also used to describe a contrary person.
Back in old Japan when times were tough and there were too many mouths for one family to feed, they might do something called kuchi herashi, or getting rid of mouths by sending your children to live with a wealthier family or hauling grandma or grandpa up into the mountains and leave them to fend for themselves.
Hitori kakurenbo (一人隠れん坊) means playing hide and seek by yourself. It sounds silly, but it’s actually a super creepy, Japanese urban myth that involves you all alone at night with nothing but a stuffed animal, some red thread, and a knife.
The rokuyo or six days is the Japanese calendar that you consult when preparing to engage in various affairs: weddings, funerals, trips, and business dealings to name a few. Some days are good for some things, other days are good for others. Some days are just bad, bad, bad.