a ヘルス (herusu, “sexual service”, literally “health”) masqueraded as a massage parlor

a ヘルス (herusu, “sexual service”, literally “health”) that dispatches prostitutes to the home

mental health

polymeter

(idiomatic) to take on a fight; lit. to buy a fight

buy on credit

stocking up

stock up

(slang) Of an adult, buying (chiefly childish) things in great amounts (due to newfound purchasing power).

(slang) To do the above.