Although she is a teenager, Yuka behaves in a manner much younger than her age because her parents pamper her. She attempts to act like an adult to be taken more seriously by her peers, but her constant failures in this regard make her appear even more immature. Her naivety renders her childlike innocence more apparent than that of most others trapped in Heavenly Host Elementary School, yet it also makes her susceptible to manipulation by the school's more ill-intentioned residents, both human and ghost. Furthermore, it leaves her more psychologically vulnerable to the school's horrors, causing her to easily break down upon seeing blood, violence, and death. Due to being spoiled, she relies on those older and more mature than herself to make decisions for her. However, her experiences throughout Heavenly Host compel her to act more on her own decisions.
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