darling in the franxx, kai ikarashi, smears, multiple girls, towel, 4girls, long hair, blush, naked towel, blue hair, green eyes, blue eyes, red hair, short hair, towel on head, open mouth, ahoge, water, partially submerged, teeth, looking at viewer, bathing, bangs, onsen, brown hair, hair between eyes, indoors, collarbone, embarrassed, grey hair, black hair, covering