tetra (pixiv), tetra takamine, black jack, black jack (character), pinoko, black jack (series), md5 mismatch, 1boy, 1girl, argyle background, argyle clothes, black hair, blonde hair, book, bow, child, closed eyes, hair ribbon, height difference, hetero, kiss, kissing cheek, multicolored hair, one eye closed, pink bow, ribbon, scar, short hair, size difference, slippers, split-color hair, two-tone hair, white hair, wink, yellow background