Ultramarine Muv-Luv Alternative: Total Eclipse : Season 1 Episode 6

As part of a morale-building exercise, Argos Flight is sent to the Caribbean for a photo shoot. During a boat race, Yui, Cryska, and Yuuya are stranded on a deserted island. Cryska gets sick, and an injured Yui tries to force herself to help, but the rain is getting worse...