URLs

• https://twitter.com/gekiko_superior
• https://twitter.com/intent/user?user_id=1460466253924282368
• https://www.mangaupdates.com/author/ik438h9
• https://en.wikipedia.org/wiki/Takayuki_Yamaguchi_(artist)
• https://ja.wikipedia.org/wiki/山口貴由
• https://anidb.net/creator/8971
• https://www.animenewsnetwork.com/encyclopedia/people.php?id=89577
• https://myanimelist.net/people/2635