乙

1. noun (the) second (party, rank, etc.); B (grade); the latter
2. na-adjective stylish; chic; smart; witty; tasty
3. strange; quaint; queer
4. expression, abbreviation, slang thank you; good job
5. abbreviation, slang see you; goodbye; goodnight

おと also 弟

1. noun, archaic younger brother (of an older brother); younger sister (of an older sister)
2. archaic youngest child
3. prefix, archaic young; younger; youngest
4. archaic young and beautiful; cute

きのと

1. na-adjective, noun second in rank; second sign of the Chinese calendar