ここ最近、ユウマの体に謎のダメージが溜まり始めていた。
そんな最中にまたも現れる宇宙獣！！ アークの力を知り尽くしたような宇宙獣はどこまでもユウマを追ってくる…。逃げ場のない最悪な状況下で固めるユウマの決意とは！？
そしてユウマの胸に宿る不吉な光の正体は！？
Yuma has been experiencing some mysterious strain on his body recently. Right then, yet another galactic beast appears! It seems to know Arc's powers well, and chases after Yuma... With nowhere to escape, what will be Yuma's decision!?
And what is the true form of the ominous light in Yuma's chest!?
