- 1998-10-00 Radifia forms under 「office Radifia」.
- 1998-10-00 【lineup】 V. Karen (架蓮) / G. Shin (深) / G. Rame / B. Hibiki / D. Hijiri (聖)
- 1999-03-00 First sponsored event, Self Decadence Joshou (Self Decadence 序章), is held, at which attendees must wear black clothes. (Exact date and location unknown.)
- 1999-08-01 Sponsored event is held at Shinsaibashi (心斎橋) NEST SALON.
- 1999-09-00 Bassist Hibiki secedes. (Exact date unknown; some time between 1999-08-01 ~ 1999-10-01.)
- 1999-10-12 Demotape release celebration tour, up to state~Kakuseihe no Kaidan~ (up to state~覚醒への階段~), begins at Niigata (新潟) JUNK BOX. A sticker is freely distributed to those who purchase tickets via Radifia to any show during the tour.
- 1999-10-12 Toshiyuki (斗愁貴) joins as support bassist.
- 1999-11-06 Tour final oneman, ∞ “LOOP”, is held at Amagasaki (尼崎) LIVE SQUARE VIVRE. A demotape is freely distributed to attendees.
- 1999-11-06 UP TO STATE~Kakuseihe no Kaidan~ 1999.11.6 Amagasaki Live Square 「Ei∞en」 released.