In an Eastern-styled fantasy setting, a brother and sister team of sacred guardians is beset by the Xuan Gui Zong, minions of Miè Tian Hai, who seeks the Tian Xing Jiàn sword that they possess. Hai's appearance leads to the defeat of the brother, but his sister, Dan Fei, jumps off a cliff to temporary safety. Later, a wandering swordsman comes across a ruined temple, where a statue of Buddha is protected by an umbrella against the rain. When he takes the umbrella for himself, a man resting under a tree nearby informs him that he must be compassionate to the next traveler he meets as a trade-off for taking the umbrella. That next traveler is Dan Fei, still being pursued by the Xuan Gui Zong minions. Both his promise and the enemy's sorcery leaves the wanderer unable to avoid getting involved. 
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(Source: Anime News Network)

Episode 0 - Before Broadcast Special

Episode 1 - Code of Umbrellas

Episode 2 - Attack of the Xuán Guǐ Zōng!

Episode 3 - The Woman In Night Devil Forest

Episode 4 - The Whereabouts of the Soul Echo Flute

Episode 5 - The Sword Devil, Shā Wú Shēng

Episode 6 - Seven Comrades

Episode 7 - Demon Spine Mountains

Episode 8 - The Enigmatic Gale

Episode 9 - The Essence of a Sword

Episode 10 - A Thief's Pride

Episode 11 - A Proud Life

Episode 12 - A Blade That Doesn't Cut

Episode 13 - A New Duty

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Thunderbolt Fantasy: Sword Travels in the East