Wakuwaku♪ Ojisan to Issho!! (わくわく♪ おじさんといっしょ‼, English: Hey Kids♪ Sing with Retired Idols) was the 2020 April Fools event featuring Jin, Akiomi, Jun, and Kohaku.
Start: 4/1/20 at 0:00 JST End: 4/1/20 at 23:59 JST
Description[]
Entering the Event Banner at the bottom left or in Info will automatically unlock the first chapter of Lullaby.
The story can also be read from the Campaign Story page.
Top Button: Takes you to where you can play a memory game (Basic) or rhythm game (Music) by choosing one of the four difficulties.
In Music only, there is a bar by the top left that controls your MV when playing: Pretty Video (きれいなえいぞう), Video (えいぞう), and Picture (え). These are equivalent to the usual MV settings offered.