Runa Suruga

Height: 152 cm (5'0")

She is one member of a close-knit, gossip-loving quartet that also includes Reo, Sakura, and Sora. Within the group, she plays the role of the "airhead." The four of them often play card-based mahjong during their downtime; despite enjoying the game, she doesn't seem to have fully grasped the rules, frequently committing fouls—a classic case of being enthusiastic but unskilled.

In fact, she was the only one of the four to get in as a waitlisted candidate; when she didn't see her number on the list of successful applicants, she threw a tantrum—shouting things like "I quit being human!" and "From today on, I'm living as a fish!"—and dove into the winter sea. (She was apparently rescued by Satoko Katsuta shortly thereafter.) She is arguably the biggest ditz among the entire ship's crew.

Despite appearing dim-witted, she excels in physics. Her father is a skilled naval architect, and she used to doodle by copying his blueprints when she was little. Thanks to that background, she is highly knowledgeable about subjects like engine mechanics and thermodynamics, though she struggles to articulate these concepts, making it difficult for others to understand her (she seems similar to Shima Tateishi in that she understands things in her head but can't explain them well). However, she and Maron Yanagihara can communicate through the way they swing their spanners, so she often serves as Maron's assistant during repairs.

Kei asked her to build a naan oven using a boiler; she is currently working on it with Sora, though it remains unfinished.