People can become demons through various means depending on the cultural, religious, or fictional context. Here are some common ways people might become demons in different narratives:

1. Religious and Mythological Contexts:

   • Sin and Corruption: In many religious traditions, individuals who commit grave sins or lead a life of corruption might be transformed into demons after death as a form of punishment or as a reflection of their inner state.
   • Pacts with Evil Entities: Some stories involve people making pacts with devils or other malevolent beings, trading their souls or morality for power, which ultimately leads to their transformation into demons.

2. Fictional and Literary Contexts:

   • Curses or Magic: In fantasy literature and games, a person might become a demon through a curse, a magical ritual, or exposure to dark magic.
   • Possession: Another common narrative involves a person being possessed by a demonic entity, which can lead to a transformation where the person's body and soul are overtaken by the demon.

3. Psychological and Symbolic Contexts:

   • Inner Demons: In psychological terms, people might metaphorically become "demons" by succumbing to their darker impulses or negative traits, such as anger, greed, or envy.
   • Symbolic Transformation: In some stories, becoming a demon can symbolize a character's moral decline or a shift from good to evil.

In the context of the game described, the transformation into a demon might be tied to the specific lore or backstory of the game's world. The narrative could involve elements like hidden secrets, curses, or supernatural occurrences within the closed women's dormitory setting.