1377. This #kanjipuzzle is about evolution. Start with one character, add a few strokes, and get another, then repeat. 一 -> ? -> ? -> ? -> ? -> 階

Answer:

一 -> ト -> 上 -> 比 -> 皆 -> 階

一  ICHI, ITSU, hito(tsu) - one

ト  Katakana "To" or The "Boku" radical - oracle

上  JOU, a(geru), ue, a(garu), nobo(ru) - up, above, rise

比  HI, kura(beru) - compare

皆  KAI, mina  - all

階  KAI - stair, storey, level