rei (danmachi), dungeon ni deai wo motomeru no wa machigatteiru darou ka, artist request, highres, official art, third-party source, 1girl, animal ears, big hair, bird ears, bird legs, bird tail, blonde hair, blue eyes, blue hair, blue wings, breasts, closed eyes, closed mouth, collarbone, criss-cross halter, facing ahead, feathered wings, feathers, from behind, from side, full body, green hair, green wings, halterneck, harpy, looking at viewer, median furrow, medium breasts, medium hair, monster girl, multicolored hair, multiple views, navel, open mouth, shoulder blades, sideboob, simple background, singing, sling bikini top, solo, standing, tail, turnaround, underboob, white background, winged arms, wings, yellow feathers, yellow wings