Undertale (Nintendo Cinematic Universe)

Undertale is a Japanese graphic novel.

Summary
Trapped in the Underground, a human child must battle against monsters to escape...but could doing so have severe consequences?

Plot Elements

 * The story takes place in the Underground, a realm to where monsters, once equal to humans, were banished after war broke out between them.
 * The Underground is sealed from the surface world by an imperfect magic barrier, the only point of entry being at Mount Ebott.
 * A human child named Frisk falls into the Underground and encounters Flowey, a sentient flower.
 * When Flowey attempts to murder Frisk to take their soul for himself, Frisk is rescued by Toriel, a motherly goat-like monster, who teaches Frisk to solve puzzles and survive conflict in the Underground without killing. She intends to adopt Frisk, wanting to protect them from Asgore Dreemurr, the king of the Underground.
 * Frisk eventually leaves Toriel to search for Asgore's castle, which contains the barrier leading to the surface world.
 * Along the way, Frisk encounters several monsters, including the skeletons Sans and Papyrus, two brothers who act as sentries for the Snowdin forest; Undyne, the head of the royal guard; Alphys, the kingdom's royal scientist; and Mettaton, a robotic television host Alphys created. Some of them are fought, with Frisk having to choose whether to kill them or to show mercy; should the human spare them, they may choose to become friends. During their travels, Frisk learns the cause of the war between humans and monsters.
 * Flashback: Asriel, the son of Asgore and Toriel, befriended the first human child, Chara, who fell into the Underground and was adopted by Asgore and Toriel. One day, Chara killed themselves by eating poisonous flowers. When Asriel returned their body to the humans, they attacked and fatally wounded him, resulting in Asgore declaring war. Asgore now seeks to break the barrier, which requires him to collect seven human souls, of which he has six.
 * After Frisk kills no monsters, Flowey is revealed to be a reincarnation of Asriel, created as part of Alphys's experiments.
 * Toriel intervenes before Frisk fights Asgore and is joined by the other monsters Frisk has befriended.
 * Flowey ambushes the group, re-taking all the human souls and the souls of all the monsters to take an older Asriel's form to fight the human.
 * Frisk connects with their new friends during the fight, eventually triumphing.
 * Asriel reverts to his child form, destroys the barrier, and expresses his remorse to the others before leaving.
 * Frisk falls unconscious and is awoken to see their friends surrounding them.
 * The monsters reintegrate with the humans on the surface, while Frisk has the option of accepting Toriel as their adoptive mother.