k2 (kazu1030), firefly (honkai: star rail), firefly (spring missive) (honkai: star rail), honkai: star rail, honkai (series), absurdres, highres, 1girl, black hairband, black skirt, blush, bow, breasts, collarbone, flower, gradient hair, green bow, green hair, grey hair, hair between eyes, hair ornament, hairband, long sleeves, looking at viewer, lotus, medium breasts, multicolored hair, official alternate costume, official alternate hairstyle, one eye closed, open mouth, pink eyes, plaid bow, plaid clothes, plaid skirt, pool, school uniform, serafuku, skirt, smile, water, wet