有り得ない: impossible

穢多: (historical, offensive) the lowest group in Japan’s caste system during the Edo period

past tense of える (eru) [ichidan]

ahem (clearing of the throat) / hmph! (triumphant)

使役: (linguistics) causative form / 私益: (finance) private interest

"to obtain a lack of events": to accomplish something without incidents

character (a being in a story)

not necessary to; don't have to

Expresses gratitude or relief for something that happened in the past, a choice made, etc.

If only ~