Watanabe Mayu’s 4th solo single Rappa Renshuuchuu (ラッパ練習中) will be released on July 10.
5 editions are available. Each CD contains 3 songs and their instrumental versions. The coupling songs are different depending on the edition.
The limited editions include either a DVD featuring the music video, its making-of and some bonus footage, or an illustration book.
This single is the tie-up song for the event Rogoku Yuenchi kara Mayuyu woSukue!! in Tokyo Dome City Attractions (牢獄遊園地からまゆゆを救え!!! in 東京ドームシティ アトラクションズ) which will be held from July 27 to September 23.
A contest titled Anata no Illust ga Shinkyoku no Jacket ni Nari Mayuyu (あなたのイラストが新曲のジャケットになりまゆゆ) was organized through the illustration sharing site Pixiv to make a cover jacket for the CD.