Images from the time confirm a 4-member lineup, with Asa (和紗) on bass. However, sources state that he was drummer, while Rin (鈴) was bassist; in that case, it's likely that Rin (鈴) joined at a later time, and that Asa (和紗) switched to drums at that point.
Note: Some sources state that at least one member might have been in L'vient Erise, but this is unconfirmed. If so, it was probably Asa (和紗), under the name of kazu (架歪), as that person was a bassist for L'vient Erise and had no known band history afterward.
V. Mikoto (命) / G. Kayane (歌夜音) / G. Ougi (扇) / B. Asa (和紗)
V. Mikoto (命) / G. Kayane (歌夜音) / G. Ougi (扇) / B. Rin (鈴) / D. Asa (和紗)