This is a DoRA, not your typically made LoRA. A1111 v1.9.0 and up is required to use this. Forge users must download two files, which can be found here. Go to stable-diffusion-webui\ldm_patched\modules and replace the files there.
Weight: 1.0
Youtou High School Uniform: rubyhoshdef, one side up, mismatched pupils, star-shaped pupils, school uniform, blue jacket, cropped jacket, long sleeves, black vest, white shirt, collared shirt, pink bowtie, grey skirt
Idol: rubyhoshidol, one side up, hair ribbon, black ribbon, mismatched pupils, star-shaped pupils, frills, red capelet, frilled capelet, red shirt, black bow, neck ribbon, black gloves, frilled gloves, black skirt, black choker
Add blonde hair and pink eyes if necessary.
The results of your generations are dependent on the additional LoRAs, weights, and models you use, so it may not work or come out as consistent as my sample images.