In order to send the spirits of the dead into the outside worldThey say Hell technically doesn't have seasonsbut there's an exception near the day of 'kamabuta tsuitachi', when they open the lids of the cauldrons of Hell.TN: The first day of the Bon Festival.
YEAAAAH!
the technicians of Hell have to work at full capacity up until that day. The heat is unmatched.Ministry of Right and Wrong. Hell.