Summer Arc

The Summer Arc is the eighth arc of the Undead Unluck manga series. It deals with UMA Summer and the bloody history between Shen and one of Under's strongest fighters.

Synopsis
Andy and Fuuko join up with Shen and Mui for UMA Summer's quest in Taiwan, with Top around looking for Summer's core. Since the UMA grows by eating gunpowder, Shen has been guarding a tower which is a storage for fireworks. However, Shen only cares about fight Andy, who has grown stronger thanks to the events of the Autumn quest, keeps trying to egg him on a fight. Just then, a hooded figure with various Summer juniors and the core appear, sending them to attack the tower as the man uses an Artifact to summon jiangshi, getting Shen's attention. As Shen fights the figure and jiangshi, he realizes that they are disciples of the school Shen trained in, and eventually, Shen realizes the hooded fighter is in fact his former mentor and source of hatred, Feng.

Shen's past is then slowly revealed throughout the arc; Shen was an urchin who lived with his younger sister Mei, wanting to become stronger so he could protect her. He eventually joined a martial arts school run by Feng to continue this promise, with Mui learning how to fight from Shen. It turned out Mui was also quite strong herself, and Feng decided to force the two siblings to fight one another, which caused Mei to fall off a cliff for being "weaker", but fell to her death thanks to Untruth's manifestation causing her to let go of his hand.

Because of Feng's role in Mei's death, Untruth stops working on him, allowing Feng to easily overpower Shen and Mui before taking the latter captive. Meanwhile, Andy is able to destroy one of the juniors, but the core is able to grow larger. Feng than appears besides it on his Kokuto'un, thanking Andy for killing Rip, allowing the latter to become young again thanks to "Life is Strange" to save Rip. Feng then reveals his plans to raise Summer into its Phase 2 to slay it at its strongest while using Mui as bait to recreate Shen's loss of his sister to overcome him as well, all for the sake of fighting God and becoming "the strongest of all creation". Andy and Fuuko fight Feng to figure out his ability, but realize Feng is strong just by pure technique. Shen appears and manages to net a hit thanks to Unluck, but rather than flee to save Mui with Fuuko, Shen tries to kill Feng again by himself. Instead, the others convince him to work together as a team, but when Feng tries to kill Fuuko and Mui with his strongest attack, Andy and Shen are forced to take the blow, leaving Shen fatally injured.

A dying Shen sees his sister Mei again, and apologizes profusely to her for killing her. However, Mei makes it clear she doesn't hate him, and tell him to get back up to protect Mui and everyone else still alive. It is through her that after Shen story continues, revealing that after losing to Feng, he vowed to become stronger, fighting whoever he could until he lost to Juiz and was recruited into the Union. He eventually rescued Mui and her dying younger brother from an UMA, he took her in because she mirrored himself and Mui, but grew to truly care for Mui even after time passed. Mui eventually brings Shen back to consciousness, long enough for him to ask Mui to kill him with Feng's artifact so that to keep fighting as a jiangshi. After Andy and Fuuko steal the artifact and Mui kills Shen, it turns out that Shen's death has cause Untruth to awaken in Mui. As a result, the two are able to defeat Feng, as Mui holds no hatred in her heart for the man responsible for allowing the two of them to meet.

After Feng is beaten, Summer finally reaches Phase 2, just as Top returns with Apocalypse in hand along with Chikara and Titania. With Mui's Untruth on Apocalypse revealing Summer's weakness, the team are easily able to neutralize it. As Summer explodes into fireworks, Shen has Mui use Untruth on Feng to see what he really though about him and the other students he raised, only to learn that Feng never cared about anything but getting stronger, much to Shen's grief.

Characters Introduced

 * Mei
 * Luo

Artifacts Introduced

 * Game of Death
 * Kokuto'un
 * Zuishin Tekkan Rod
 * Basho Fan