Talk:Lust Friend/@comment-2601:243:1500:4E0C:15BF:59AA:B4A5:182D-20190609203237/@comment-34962159-20190610005255

There's a guide here: http://625plus.blog.fc2.com/blog-entry-154.html.

Basically, you first need to get the normal ending, then you need to befriend every enemy (except Empress) and talk to Mea in each of the four locations. Then go back to the top of the tower and meet Empress again, this time befriending her (this requires specific conversation options, also mentioned in the guide). Then you'll be taken to the true final boss, whom you also need to befriend.