火種
Common
Noun
1
noun (common) (futsuumeishi)
live coals (for firelighting)
おっと！火種が残りすくないぞ！薪割りしてくれ！
Whoops! There aren't many live coals left! Go make some kindling would you?
2
noun (common) (futsuumeishi)
cause (of disturbance, conflict, etc.);trigger