Unknown BGM from Japanese "inmu" meme community

[funky fart]

Most of them are probably from Japan.
1.hxxps://www.bilibili.com/video/BV1Bw411J7cS/?spm_id_from=333.337.search-card.all.click&vd_source=9442524dc16ad3c6e980458def9d9c79
2.hxxps://www.bilibili.com/video/BV1rf421X7WP/?spm_id_from=333.337.search-card.all.click&vd_source=9442524dc16ad3c6e980458def9d9c79
3.hxxps://www.bilibili.com/video/BV1migGeAE5J/?spm_id_from=333.337.search-card.all.click&vd_source=9442524dc16ad3c6e980458def9d9c79 0:15start
4.hxxps://www.bilibili.com/video/BV1rw4m1Y713/?spm_id_from=333.337.search-card.all.click&vd_source=9442524dc16ad3c6e980458def9d9c79 0:20start
All unknown

[funky fart]

1L