manta ray, specifically, a giant oceanic manta ray (genus Manta)

Alternative spelling of 餓鬼: (pejorative, slang) an unpleasant child, a brat

stonefish

it is easier said than done

(Japanese mythology) one of the first three gods who came into existence when heaven and earth began (天地開闢 (tenchi kaibyaku)), along with 天御中主 (Ama no Minakanushi) and 神皇産霊 (Kamimusuhi)

(Japanese mythology) possibly a goddess, one of the first three gods who came into existence when heaven and earth began (天地開闢 (tenchi kaibyaku)), along with 天御中主 (Ama no Minakanushi) and 高皇産霊 (Takamimusuhi)

a goal cannot be attained easily

Zhangjiakou (a prefecture-level city in Hebei, China)

a female given name

author of hentai (pornographic manga)