Footprints in the Waves (S01E21)

S01E01 Welcome to Torishirojima Island S01E02 Ways to Spend Your Summer Vacation S01E03 Pirate Ship and Girl S01E04 One Summer's Treasure S01E05 Higeneko Adventure S01E06 Across the Seven Seas S01E07 The Lighthouse, the Song and the Girl S01E08 Looking for Things to Do S01E09 Tsumugi and Tsumugi S01E10 A Lifetime's Worth of Summer Breaks S01E11 The Summer Butterfly and the Night Girl S01E12 Priestess of Sorakado S01E13 A Pair of Butterflies S01E14 Dawn Memories S01E15 The Girl Who Forgot Summer Vacation S01E16 Not a Date S01E17 Natsudori Ritual S01E18 One More Summer Vacation S01E19 Magic Picture Diary S01E20 Marriage S01E21 Footprints in the Waves S01E22 Towards That Summer S01E23 Nanami S01E24 Where the Sunshine Is S01E25 Memories of the Future