Seven:
Amu
Ran
Miki
Su
Dia
Yoru
Aruto Tsukiyomi (Ikuto's father)
Seas:
Aruto Tsukiyomi, Ikuto's father, was लॉस्ट overseas.
Treasure:
Amu Hinamori is the treasure Ikuto has been searching for.
आप would mostly get touched if आप were an Amuto प्रशंसक like me. But even if आप ship Tadamu या other Amu/Ikuto related couples, आप could still get touched द्वारा Seven Seas Treasure's meaning.