(anglicism) regret (remorse) / (decision theory) regret

foolish and base

紅蓮地獄: the Padma Hell

(slang) adult fans of an anime, a manga aimed at children

(slang) Alternative form of 大きいお友達

(idiomatic) A piece of cake; an extremely simple thing, something trivial, a cinch, easy as pie.

朝飯前: A piece of cake; an extremely simple thing.

(telephony) a common Japanese telephone greeting: hello; used when answering the telephone / used to confirm that the person being addressed is listening, or to confirm if anyone is listening

put away

everything