In the third volume of the Tsukihime manga, an illustration (possibly NSFW) of a number of female characters at a hot spring appears.
I can recognize most of the characters here. (Akiha stands outside of the bath with the twins Hisui and Kohaku; Arcueid is sitting on a stone surface, with Len at her feet; the girl left of Arcueid is Yumizuka; and Ciel is wearing her glasses.) However, I don't recognize the blonde character with green eyes or the brunette with a bathing cap.
Who are these two characters?