There are several Loras of Ai, Rin and several other girls from this questionable H-Anime, but not Yua and Chie, so... here they are!
For Yua: oomiyuaIL25, brown hair, short hair, ahoge, blue eyes, hairclip, blush stickers, school uniform, long sleeves, bow, skirt, black thighhighs, necktie, zettai ryouiki
For Chie: maedachieIL25, large breasts, glasses, green hair, hairband, brown eyes, school uniform, long sleeves, bow, skirt, black thighhighs, necktie, zettai ryouiki
Note: Drop "Retro artstyle" for extra accuracy.