Matsuri Tendou, 16, is a vibrant and outgoing member of Team Summer B. As the daughter of a farmer, she possesses practical agricultural knowledge relevant to surviving the post-apocalypse. Prior to cryonic preservation, she had been running away from home.

This farming background shapes her perspective on nature, leading her to observe that plants are Earth's strongest living entities due to their resilience and adaptability—a view notably shared by another character's father. This reflects her practical understanding of ecosystems. Matsuri harbors romantic feelings for Ryo of Team Summer A. Her interactions with him evolve: initial admiration shifts to confrontation over his harsh treatment of others, demonstrating her growing assertiveness. This confrontation strains their relationship but reveals her willingness to address difficult truths despite emotional cost.

Stranded at sea with Ryo and Ango, Matsuri takes charge of cooking and food rationing. She actively participates in group tasks, calling others for meals and managing supplies, though her portion size decisions sometimes spark minor disagreements about resources. Her presence helps sustain group morale during isolation.

Matsuri's development includes moments where she offers unexpected wisdom, drawing parallels between plant survival strategies and human resilience. Her journey involves adapting from a relatively carefree disposition to critically engaging with complex interpersonal dynamics and survival challenges.