User blog comment:Crimson and Darkness/High School DxD DX.5 discussion/@comment-37710600-20190323174615/@comment-2208155-20190323185508

japanese wiki:

https://ja.wikipedia.org/w/index.php?title=%E3%83%8F%E3%82%A4%E3%82%B9%E3%82%AF%E3%83%BC%E3%83%ABD%C3%97D%E3%81%AE%E7%99%BB%E5%A0%B4%E4%BA%BA%E7%89%A9&