This is the closest anime to Kaiju No. 8 in terms of storyline. The story follows a world where monsters from another dimension constantly attack Earth for their benefit.
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Attack On Titan
Attack On Titan is a popular shonen anime with a similar story to Kaiju No. 8 But later the story becomes so intense that no other anime can match that.
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86
86 is another popular mecha anime of modern times. The story follows two countries which are constantly fighting each other. But citizens Don't know the reality. You get shocked in the end.
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Darling In The Franxx
Darling in the Franxx is an underrated mecha anime with good action and a thrilling storyline. The bond between lead is similar to Kafka and Mina. This anime also deals with monsters.
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Goblin Slayer
Goblin Slayer is another popular anime which also deals with monsters but especially with goblin. The MC hate Goblin just like Kafka hates Kaiju. This anime is packed with action thrillers.
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Seraph of the End
If you want to watch something unique then watchSeraph of the End The story follows a world where humans die of a virus and the whole world is ruled by vampires and other species.
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Parasyte
Parasyte is one of the best anime-packed action and thrillers. The story follows an unknown species that takes control of the human body. And our protagonist's right is also taken over by this species.
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Tokyo Ghoul
Tokyo Ghoul is a classical dark anime. The story follows a war between two species humans and ghouls and both are fighting each other for their existence.