Trigun: The Lost Plant

Trigun: The Lost Plant (TRIGUN ～THE LOST PLANT～) is an extra chapter of the Trigun Maximum manga and is drawn by Boichi.

Summary
At one point, Verona Tsubasa starts hearing a voice in her head, calling her VTS and to come to her. Even though she doesn't know where, Verona ends up on a journey trying to find the person from her head. On her journey, she met Vash who calls himself VTS and he decided to join her. They eventually reach the Grand Canyon, where Verona believes its her final destination. There they see multiple people calling themselves VTS, who are fighting each other. Verona tries to come up with a plan, but Vash rushes and yells that he is the real VTS. That provokes the others and Vash joins them in a fight.

Verona heads down the canyon, recalling its been six years since the legendary battle and its been mostly peaceful since then. She finds remains of a migration ship. As she inspects it, she finds a person in one of the plants, and realizes it must have been living alone for 200 years. The plant thanks VTS for coming and explains they can produce matter, and since she spend so long there, she had time to think about it. The plant speaks about the vibrations of the vacuum and how the universe was created with a fixed quantity of energy. In time, the energy and matter she had been producing, had become a "child".

Vash appear and wonders if a plant "child", just like him and Knives, will be born. The plant then confirms to VTS, Vash the Stampede. Verona is shocked to learn that VTS was meant to be Vash and its his name initials. The plant explains she called Vash, because she wants Vash to kill them. She is aware that Vash doesn't kill, but her child is special. It contains so much energy and matter that it will vaporise the planet in an instant. When its born it will move with 40,000 km per hour and explode in a hundred of a second, causing a new Big Bang, which will suck this universe and create new one. The plant tells Vash that she estimated six shots to her womb would end both of their lives. Vash points his gun, stating he came to protect what Rem risked her life for. The plant wonders if the new universe would be better, but urges Vash to shoot her. However, Vash keeps waiting. The plant tells him its too late now and the child is being born. In that instant, Vash shoots six times. Verona believes that he did it in the moment of birth to save the plant, but the plant explains that Vash shot a bit different, which didn't destroy the child, who was sucked into a sub-space, where it created a new universe. The plant states Vash made more calculations than she in 200 years, but Vash tells her, that he too had an eternity.