alumni association (association of former students) / class reunion

talking about oneself (especially, when the audience is not interested)

(idiomatic) to keep a secret when asked about it, but let it slip inadvertently when chatting on another occasion

(archaic, colloquial) a nickname of Ariwara no Narihira, Heian-period waka poet

just as in the old days, just as it used to be

(archaic) used in the beginning of narratives or story literature: once upon a time, long ago

(Internet slang, derogatory) talking about oneself whenever possible; self-centered

(Tōhoku) Synonym of 昔話 (mukashibanashi).

(idiomatic) to keep a secret when asked about it, but let it slip inadvertently when chatting on another occasion