matsuo yukihiro, kishimoto ayase, chaos;head, science adventure, game cg, non-web source, official art, 1girl, black necktie, black skirt, blue hair, blush, casual, d-sword, dress shirt, embarrassed, goth fashion, holding, holding sword, holding weapon, looking at viewer, midriff peek, necktie, open mouth, pink eyes, shirt, short hair, skirt, solo, sprite, sword, transparent background, weapon, white shirt