No Last Seen～shinobi description

"Shinobi" is an Android app that enables you to read messages without marking them as "read" or "last seen".

Usage is very easy.
When a message comes, Only open the "Shinobi" in the Notifications

Devices using Android 5.0 and later have new settings.
http://awalker.jp/app_chirami/en/settings2.php