For the cleanup part:

1. Lantis is using a new format of URL for discography pages, and old URLs are redirected to the new ones, e.g.: http://www.lantis.jp/release-item2.php?id=4f22309153ca42524c19c94914de7cdd -> http://www.lantis.jp/release-item/LACM-4820.html
   URL cleanup should be updated to accept and auto-select the new link format, and the old ones probably need to be cleaned up manually.
2. Additionally it should be possible to normalize scheme to HTTPS and domain to www.lantis.jp since this is written on the website of its parent company - Bandai Namco Arts, although lantis.jp works with both http/https and with or w/o www. (Normalization helps with preventing duplicate URLs.)