URLs

• https://www.pixiv.net/users/58865546
• https://www.pixiv.net/stacc/user_zkgs5434
• https://twitter.com/18Quartet
• https://twitter.com/intent/user?user_id=1301650834871255041
• https://quartet18.fanbox.cc
• https://www.patreon.com/Quartetscary