Summary: Katsuragi Takumi was the founder of Faust! Sento and Ryuga are frozen by
these words that BloodStark just revealed to them. A fearsome power may
be at work behind the murder of Katsuragi Takumi. And this is mostly
because Build’s lost memories are involved. There is a sign that secret
data entrusted to his mother by Katsuragi might be a clue. While talking
to Katsuragi’s mother, these two become certain that this data
collection exists. The fight between Build and Faust arises once again
over the existence of this mysterious data…