As a Death Trope, all spoilers will be unmarked ahead. Beware.
Murder by Inaction in Anime and Manga.
- 7 Seeds:
- During the Final Test, a group of girls takes Ayu, whom they have been bullying, along with them and uses her as their cook. They decide they want to eat something with chopsticks and make them out of a tree's branches, while Ayu makes her chopsticks out of a different tree's branches. While eating, the girls end up dying from poison and blame Ayu for this, who calmly tells them that they were the ones that made their chopsticks from a poisonous tree-type.
- When Team Summer A awakens in the future and realizes that Usami is their chosen guide, they enact their revenge on him and all, except for Ban, shoot him non-fatally. Usami tells Ban to use his medical knowledge and save him. Ban states that his medical skills are lacking and Usami is left to die. It's Played for Drama, though, as Ban is shown to already have been distraught over not being able to save more people during the Final Test and might not have meant malicious intent with leaving Usami.
- Bleach: Mayuri Kurotsuchi admits to Uryu Ishida that he intentionally held back Soul Reaper reinforcements so Uryu's grandfather Soken would die and Kurotsuchi could take his body and soul to study.
- Dragon Ball Z: During the Frieza Saga, after Vegeta takes a mortal wound from Krillin as part of a plan to have Dende heal him and receive a Zenkai boost, Dende initially refuses to do so and is fully prepared to let Vegeta die since Vegeta was just as evil as Frieza and had killed numerous Namekians himself. Ultimately subverted when Gohan, Krillin, and Piccolo persuade him to do so since they need Vegeta to stand a chance against Frieza.
- One of L's more immoral plans in Death Note is to allow the Yotsuba group to kill some of the people they planned to, so he can have enough evidence against them. Granted, if they were arrested right then and there, the task force would have to let them go because of a lack of evidence, but still.
- In Fairy Tail, Loke/Leo ends up being accused of this crime. He and Aries were Celestial Spirits in the service of the cruel Karen Lilica, and to save Aries from Karen's wrath, he switched places with Aries, and gave Karen an ultimatum- he'd remain in the human world and refuse to help Karen until she canceled both their contracts. Karen was initially confident that since Leo couldn't remain in the real world forever, he'd soon be forced to give up, but he lasted longer than she expected. In the end, Karen became desperate since, without her spirits, she couldn't work as a mage, and she eventually went on a job anyway and got herself killed. The Celestial Spirit King blamed Loke for his mistress's death and banished him until Lucy successfully pleaded his case, saying that he'd only been protecting his friend Aries.
- Fruits Basket: Near the end of the series, Kyo reveals that he's responsible for the death of Kyoko, Tohru's mother. He was there the day she was hit by a car and could have pushed her out of the way, but doing so would have led to him transforming in a busy street and exposing the Sohma curse, so he stood by and did nothing. The grief and guilt over his role in the accident haunts him to this day, especially since he mistakenly believes Kyoko died hating him for it.
- Hell Girl: One episode shows Leon Yamada. He is a special example of a Barbaric Bully because he beats weaker classmates and robs them. He also attacks and injures adults. Besides, he has joined a criminal gang and tries to run over a puppy. When he makes an accident with his scooter, the three teenagers who are his most frequent victims see it. They go to him, but leave him lying without helping him, so that he will die as a result of the traffic accident.
- Is It Wrong to Try to Pick Up Girls in a Dungeon?: Three evil adventurers try to do with Liliruca. They belong to the same familia, and have mistreated the young girl for years. Eventually, they leave her as bait for monster ants while fleeing themselves. But Bell comes and saves her. And shortly thereafter, these three adventurers are killed by a minotaur.
- Naruto: The novel Itachi Shinden: Book of Dark Night reveals that this was how Shisui Uchiha gained the Mangekyou Sharingan. He was on a mission with a close friend, who fell behind fighting the enemy forces. Shisui was jealous of said friend's talents and intentionally decided not to help him, resulting in his death.The guilt of realizing what he'd done was what awakened the Mangekyou in him.
- Now and Then, Here and There: At the very end, Abelia watches while King Hamdo's palace is flooded and he drowns. In this case, it's half this trope half The Dog Bites Back since Hamdo certainly had it coming, but Abelia's face makes it clear she's still rather conflicted over it.
- One Piece: This is the public story about Fisher Tiger's death; after a fierce battle, he was suffering from severe bloodloss and needed a transfusion, only for him to be denied the necessary blood by humans which resulted in his death. In truth, there was actually was plenty of human blood readily available, but Tiger refused to take it due to his subconscious hatred of humans, which actually makes it a case of Death by Racism.
- Overlord (2012): What primarily leads to Erya Uzruth's death, even if Hamsuke was the one who dealt the death blow. Did he really expect his elf maidens to use their magical powers to save him when he was so clearly outmatched?
- Puella Magi Madoka Magica: In one of the alternate timelines in episode 10, Kyubey (who has a problematic preference for the majority) decides to do nothing about the human species' potential extinction when Madoka's transformation into a witch gives its own species enough energy to justify considering them to have outlived their usefulness.
- Trigun: Discussed. Legato points out to Vash that by his unflinching refusal to kill anyone, no matter how evil or dangerous, he is in fact responsible for the deaths they caused. He ultimately makes his point in an inversion of this trope, forcing Vash to actively kill him in order to save someone else.
- Yuureitou: This turns out to be the real way Tetsuo's adoptive mother died: she was tied to the clock tower by a killer after the treasure within, but since she'd abused Tetsuo for his transgender identity as a child (including leaving him to die in the trap-filled labyrinth beneath the tower until he pretended to cry 'like a real girl'), he simply stood and watched. Tetsuo himself makes no attempt to claim it wasn't murder, telling the cops he'd killed her and using it as a reason that Amano shouldn't be his friend.
