Trying to figure out the password for this stage.
https://bowlroll.net/file/193526

The "hint" on seiga.nicovideo translated to "Pass: Life energy that can be seen by some Vita who draw old blood lines (Katakana four letters)"
パス：古き血筋をひく一部のヴィータが視る事のできる生命エネルギー(カタカナ四文字)

EDIT: Nevermind, I figured it out. it's "フォトン"