boundary / a bounded area or region / a bounded group of people, a society, a world as a social grouping, such as business, celebrities, or finance / the border edge of a thing

border, boundary, limits

everything

(colloquial) current boyfriend

everyone, one and all

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

sneak into, slip into

to be proficient, skilled, experienced

to obtain, to come into possession, to become available

ashamed and unable to show one's face