Shape Moon: a Knight's Journey

A young man who died in a gas leak explosion accidentally traveled to the Fate/UBW world and became the Knight of the Round Table, Bedivere. He accidentally summoned Altria (Alter) to fight side by side during the Holy Grail War. Not only did he rewrite the tragic trend of the original work, but he also successfully won the Holy Grail victory. However, before the journey was over, an accident took him and Heidi to Chaldea. From then on, Bedivere joined Fujimaru Ritsuka's team and joined in the grand journey to save humanity. However, he gradually discovered that there were more and more "Altoria" around him...