Mari gets in trouble with her mother after she fakes her signature on a permission slip and is tasked with passing all of her tests. With the threat of studies looming, Mari and the others head to a summer training camp for the expedition, where they meet the team captain, Gin Todo. The girls first take part in a route mapping exercise where they must determine a route and place flag markers down. While spending their first night in a tent, Shirase explains how Gin went with Takako on a previous Antarctica expedition that the latter did not come home from. Early the next morning, Mari comes across Gin, who shows her the sunrise and tells her about what Takako was like.