black key (of a piano, etc.)

white key (of a piano, etc.)

(idiomatic) to hold the key (to)

to lock (a door, etc.) / (Internet slang) (of a SNS account) to change privacy setting to limited people and posts and/or profiles can be seen by limited people.

middle, medium / average; neither good nor poor / during; being in the process of doing / second volume of a three volume set

China or Chinese; Sino- (prefix)

being in the process of doing

a surname / a female given name / a surname

(mahjong) red dragon (tile)

御中: belly, tummy, stomach, abdomen; a meal, especially of rice; cotton batting; (historical) the title of a maid working in the inner part of a samurai family's house during the Muromachi period