wa-ii-hataraku-saibou-ch01.png

Translation

• Context: the Red Blood Cell thanked the White Blood Cell for his hard work. The White Blood Cell responds:
• rei wa ii
  礼はいい
  "Expressing gratitude is good." (literally.)
  • Which means:
  • Thanking is unnecessary.
  • rei wa iranai 礼は要らない
    [I] don't need [your] thanks.
• shigoto wo shita dake da
  仕事をしただけだ
  [I] only did [my] job.
  • He's saying he doesn't need to be thanked for just doing what he was supposed to do anyway.