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Would they team up to escape, or would the best friend try to convince her to go back?

Mizuho’s romantic arc is one of vulnerability. She starts the series guarded and cynical, hiding behind a cool exterior. Her relationship with Hikaru was stunted because she refused to be vulnerable. The storyline is an act of penance; she learns to open her heart to others (friends, family) because Hikaru’s "ghost" (his lingering influence) pushes her to be honest.