けん
ken

Noun
Counter

1. matter; affair; case; item; subject

わたくしはこのけんかんしては、あなたに賛成さんせいです。
watashiwa kono kenni kanshitewā natani sansēdesu
I agree with you on this issue.
Counter

2. counter for (received) emails, text messages, voicemail messages, etc.

死亡しぼう事例じれい19件けん全体ぜんたい20%ぱあせんとえており、過労かろう深刻しんこく実態じったいりになった。
shibōjirēga jū kyūkento zentaino nijuppāsentō koete ori karōshino shinkokuna jittaiga ukiborini natta.
With 19 cases of death forming over 20% of the whole, the grave reality of overwork-deaths has been thrown into relief.
Counter

3. counter for accounts (on a website, email service, etc.)