Just be myself!! is a Weiß Schwarz card from プレミアムブースター アイドルマスター 765PRO ALLSTARS IAS/SE52-59. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
If you don't have a 《Music》 character, this cannot be played from hand. Choose 1 of the following 2 effects and resolve it, a) "Search your deck for up to 1 《Music》 character, show it to your opponent, add it to hand, and shuffle your deck afterwards." b) "Choose 1 of your characters, this turn, it gets +3000 power, then Send this to Stock."
This card was printed in Japanese only; the English text above is an unofficial community translation.