It could be due to various factors like a battle, a tragic accident, or a disease in the manga's storyline.
Family pressure. The boy's family might oppose his relationship. If he was deeply in love and couldn't bear to be separated from his love, the constant family pressure and the inability to be with the one he loved could drive him to take his own life in a desperate attempt to escape the situation.
There could be several reasons. Maybe there was a mistake in the initial medical assessment, like incorrect chromosomal analysis. Additionally, family dynamics might contribute. For instance, if there are no daughters in the family and the parents are desperate for a girl, they might take this extreme step. Social pressure can also be a factor. If in a particular community having a girl is highly valued and the family wants to fit in, they could choose to raise a boy as a girl, regardless of the long - term consequences for the child.
One reason could be magic. Just like in fairy tales, a magical spell or object might cause the transformation. For example, a magic potion that was drunk by mistake.
One reason could be greed. Maybe she sees a chance for a more luxurious life with someone else. Another could be that she has fallen out of love but is too cowardly to be honest about it.
One common reason is for entertainment, like in plays or movies. Another could be for a bet or a dare among friends, just for the fun of it.
One reason could be jealousy. Just like I said before, if a boy is good at something like getting better grades or being more popular, a girl might bully him out of envy. Another reason could be that the girl has some problems at home and takes out her frustration on the boy.
One reason could be family's disappointment with the child's gender. For instance, if a family really wanted a girl but had a boy, they might try to force the boy to be like a girl. Another reason might be some superstitious beliefs in certain cultures. They may think that by making a boy act like a girl, they can avoid some misfortunes.
Well, in a story, a boy might dress as a girl to hide his identity. Maybe he is on the run from some bad guys and dressing as a girl can throw them off. Also, it could be for a special event in a community that encourages cross - dressing for fun and unity. For example, a carnival where people can be whoever they want to be for a day. Additionally, it could be part of an experiment to study how people react to different genders and the social constructs around them.
The physical appearance plays a huge role. If a boy has a slender build and a fair complexion, it can be misconstrued as more feminine. Moreover, if his mannerisms are gentle, like walking or talking softly, it can lead to the confusion. Sometimes, even the accessories a boy might be wearing, like a bracelet or a headband, can make people think he is a girl.
One reason could be for a performance like in a play or a show. Just like in the previous stories, when there is a need for a male actor to play a female role. Another reason might be for a prank or a joke among friends. Maybe they are making a funny video or something.