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Translation

• Context: Soul Eater ソウル＝イーター warns Maka Albarn マカ＝アルバーン about the dangers of not going outside for too long.
• itsumademo uchi no naka de kusubuttetara...
  いつまでも家の中でくすぶってたら･･･
  If [you] keep secluding [yourself] inside [your] home...
• atama kara kinoko ga haechimau zo
  頭からキノコが生えちまうぞ
  Mushrooms will sprout from [your] head.