Used Yggdrasil Vol 2 English Manga
The world of Yggdrasil is more dangerous than ever, as bugs in the system cause high-level monsters to spawn at random. Ko and his friends continue to play, though the quests are getting harder. When the company challenges the players to find the source of the glitches, Ko decides to log on his high-level character, Phantom -- and accidentally discovers the identity of the mysterious songstress, Teal!
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