kotobuki hajime, hitotsubashi yurie, saegusa matsuri, shijou mitsue, shijou mitsuki, kamichu!, hand on shoulder, 00s, 3girls, age difference, back, black one-piece swimsuit, blue eyes, blue hair, blush stickers, breast envy, breast suppress, breasts, brown eyes, brown hair, cleavage, embarrassed, flat chest, from behind, large breasts, long hair, looking at viewer, looking back, multiple girls, one-piece swimsuit, outdoors, ponytail, pool, poolside, purple hair, school swimsuit, shadow, short hair, smile, standing, swimsuit, towel, upper body, water, wet