フリーBGM素材 https://commons.nicovideo.jp/material/nc67166.

関連ツイート

https://twitter.com/d4vm2ae8jf5j49/status/1401538616908787712 https://twitter.com/chizuTsuyShinGo/status/1401536637901836297 https://twitter.com/kf_maiko/status/1401536457773182980 https://twitter.com/loo5f4uhrwhtu3/status/1401535848596721673