Line is the most popular messaging app in Japan. Within the app you can purchase stickers that can enhance chat conversations, similar to emojis. The concept behind this set is that the characters only answer yes or no (with a few variants). I thought that western sarcasm wasn’t properly conveyed in the Japanese sticker set.
You can purchase this sticker set through the line app or by going to this LINE store page.
Line store screenshots
Conversation examples
