Aika and Eri discover an old airport at the bottom of ocean.
Saison 1
S01:E01 - Secret Game
Aika is training to get her salvager's license and joins the Treasure Hunting Club at school.
S01:E02 - Peach Peach Beach
The Treasure Hunting Club goes to the beach to relax.
S01:E03 - Deep Blue Girl
Aika and Eri discover an old airport at the bottom of ocean.