One possible plot is that the guy in the van is actually under the control of a more powerful villain. The anime girl, who might be a key figure in the anime's lore, is kidnapped to be used as a bargaining chip. However, during her captivity, she befriends a small creature or another captive in the van. Together, they come up with a plan to escape and expose the real villain behind the kidnapping.
She may start by trying to figure out who the kidnapper is and what his motives are. If she has any special abilities or skills, she would be thinking about how to use them to her advantage. For example, if she has telepathic powers, she could try to send a distress signal to her friends or family. Also, she might try to gain the kidnapper's trust in order to find a moment to escape.
Maybe the guy in the van has a personal vendetta against Sango. He might be someone from her past that she wronged accidentally. In the fanfiction, Sango could use her combat skills to try and escape the van when the kidnapper least expects it.
She could be held hostage in an abandoned building. The kidnapper might demand a ransom from her friends in the anime. Her friends would then have to figure out how to get the money and rescue her without getting caught by the kidnapper's traps.
In fanfiction, if an anime girl is kidnapped by the military, it could lead to a story of rescue. Maybe her friends or some heroic characters will start a mission to save her. They might have to face various challenges set by the military, like security systems and trained soldiers.
One possible motive could be for experimentation. They might believe the anime girl has unique abilities that could be harnessed for military purposes, such as superhuman strength or special psychic powers.
The anime girl might be used as a bargaining chip. If there are different factions in the military or if there is some sort of political turmoil, the group that kidnapped her could use her to gain an advantage. For example, they could threaten to harm her if their demands are not met.
One possible plot could be that the girl is a journalist who was in the wrong place at the wrong time and got kidnapped while covering a story in a conflict - ridden area in Malaysia. She uses her wits to try and communicate with the guerillas, gradually earning their respect. Eventually, through her own efforts and some external help, she manages to escape.
One possible plot could be that the girl is kidnapped from a place where she left her glasses behind. She is a key figure in a certain event, and the kidnappers want to use her for their own gain. Without her glasses, she struggles to adapt to the new environment at first. However, as time passes, she befriends another captive who helps her get around. Together, they plan an escape and in the process, she discovers that there's more to her kidnapping than she initially thought.
One common plot twist could be that the kidnapper turns out to be someone the anime girl thought she could trust, like a seemingly friendly acquaintance. This adds an element of betrayal to the story.
Well, it could be about the challenges they face during the pregnancy. Maybe Van and Hitomi have to deal with family reactions, or they could be worried about their future together while expecting a baby.