one's real character

日本鰻: Japanese eel

secondhand books

the real thing (of an event or action); getting serious / (entertainment) performance or (actual) recording (as opposed to a rehearsal)

a Japanese hare (Lepus brachyurus)

foundation, basis, basic fundamentals

(publishing, printing) folio (large book made from sheets of Mino washi paper folded in half)

scriptwriter, playwright

a Japanese wolf, Canis lupus hodophilax

pornographic publication (magazine, book, etc.); smut