Nandeyanen is a new Android app that lets you plunge your friends with the famous Japanese phrase "Nandeyanen!" The app is designed for those who want to create funny and embarrassing stories with their friends. It offers two ways to play - by shaking your phone or tapping the screen. The app has three modes - Normal, Select, and Lips - and features over 20 types of "Why Ya Ninen" for the ultimate plunge experience.

The app is developed by 株面白革命capsule and is available for free in the Lifestyle category. If you're looking for a fun and entertaining way to create hilarious memories with your friends, Nandeyanen is a must-try.