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