A book about Kasumi and Saaya reminiscing of their past (The game 'BanG Dream! Girls Band Party!' Popipa band story season 2 "Double Rainbow.")<br/><br/><strong>Links:</strong><br/><a href="https://www.pixiv.net/member.php?id=8924218">Author's Pixiv</a><br/><a href="https://twitter.com/rak_gaki_riku">Author's Twitter</a>