Kuraki Ena

Grade: High school 1st year student
Ayumu's self-proclaimed childhood friend. However, for some reason, Ayumu can't remember her nor does he remember ever seeing her in the island. Despite this, like a long-time and noisy friend, she calls him "Aa-chan", which tries Ayumu's patience a lot. Ena has some stalker-like qualities as well: despite being in different class than Ayumu and the others, she's always close to them. Ena is also the student council's secretary. She also won't tell Ayumu what kind of gear she possesses, except for the fact that it's not suited for combat.