oniisan-oneechan-hataraku-saibou.png

Translation

• Context: a "platelet," kesshouban 血小板, drawn as a cute anime girl, referring to other cells.
• a', {hakkekkyuu no} oniisan ita yo!
  あっ　白血球のお兄さんいたよ！
  Ah, big brother {white blood cell} [is over there]!
  (appositive no-adjective.)
  • iru
    いる
    To be [somewhere].
• a', {sekkekkyuu no} oneechan!
  あっ　赤血球のおねーちゃん！
  Ah, big sis {red blood cell}!