Taking place after the events of the fourth film, the series centers on 11 yr old Keisuke Amano, Natsume's younger brother (both of whom are the children of Keita Amano and Fumika Kodama of the original Youkai Watch anime) who doesn't believe in any supernatural phenomenon around him. But as he notices his sister is frequently comes back home late, he decided to stalk her, only to find out she is doing her duties exorcising evil Youkai alongside her friends Touma and Akinori, and running a Yo-Kai detective agency. With their secret revealed to him, Natsume decided to let him tag along in her activities as they investigate Youkai crimes and take on evil Youkai to maintain peace all over the city.

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Youkai Watch: Shadow Side Episode 60
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Youkai Watch: Shadow Side Episode 59
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Youkai Watch: Shadow Side Episode 58
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Youkai Watch: Shadow Side Episode 57
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Youkai Watch: Shadow Side Episode 56
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Youkai Watch: Shadow Side Episode 55
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Youkai Watch: Shadow Side Episode 54
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Youkai Watch: Shadow Side Episode 53
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Youkai Watch: Shadow Side Episode 52
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Youkai Watch: Shadow Side Episode 51
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Youkai Watch: Shadow Side Episode 50
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Youkai Watch: Shadow Side Episode 49
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Youkai Watch: Shadow Side Episode 48
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Youkai Watch: Shadow Side Episode 47
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Youkai Watch: Shadow Side Episode 46
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Youkai Watch: Shadow Side Episode 45
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Youkai Watch: Shadow Side Episode 44
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Youkai Watch: Shadow Side Episode 43
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Youkai Watch: Shadow Side Episode 42
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Youkai Watch: Shadow Side Episode 41
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Youkai Watch: Shadow Side Episode 40
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Youkai Watch: Shadow Side Episode 39
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Youkai Watch: Shadow Side Episode 38
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Youkai Watch: Shadow Side Episode 37
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Youkai Watch: Shadow Side Episode 36
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Youkai Watch: Shadow Side Episode 35
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Youkai Watch: Shadow Side Episode 34
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Youkai Watch: Shadow Side Episode 33
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Youkai Watch: Shadow Side Episode 32
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Youkai Watch: Shadow Side Episode 31
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Youkai Watch: Shadow Side Episode 30
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Youkai Watch: Shadow Side Episode 29
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Youkai Watch: Shadow Side Episode 28
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Youkai Watch: Shadow Side Episode 27
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Youkai Watch: Shadow Side Episode 26
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Youkai Watch: Shadow Side Episode 25
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Youkai Watch: Shadow Side Episode 24
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Youkai Watch: Shadow Side Episode 23
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Youkai Watch: Shadow Side Episode 22
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Youkai Watch: Shadow Side Episode 21
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Youkai Watch: Shadow Side Episode 20
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Youkai Watch: Shadow Side Episode 19
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Youkai Watch: Shadow Side Episode 18
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Youkai Watch: Shadow Side Episode 17
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Youkai Watch: Shadow Side Episode 16
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Youkai Watch: Shadow Side Episode 15
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Youkai Watch: Shadow Side Episode 14
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Youkai Watch: Shadow Side Episode 13
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Youkai Watch: Shadow Side Episode 12
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Youkai Watch: Shadow Side Episode 11
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Youkai Watch: Shadow Side Episode 10
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Youkai Watch: Shadow Side Episode 9
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Youkai Watch: Shadow Side Episode 8
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Youkai Watch: Shadow Side Episode 7
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Youkai Watch: Shadow Side Episode 6
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Youkai Watch: Shadow Side Episode 5
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Youkai Watch: Shadow Side Episode 4
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Youkai Watch: Shadow Side Episode 3
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Youkai Watch: Shadow Side Episode 2
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Youkai Watch: Shadow Side Episode 1
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