The Flower of Evil, the vitality of that flower is a bit incredible. It is obviously born from the ultimate evil, but it is white, and it almost firmly believes in the light.
However, the following is the real reason
You are a time traveler, transmigrated, but you still have amnesia.
You are a magician, orthodox, but you just can't use magic.
You had magic power but couldn't use it, so you decided to participate in the Holy Grail War. Although you had an ominous feeling, you still participated.
You joined the Holy Grail War when your flight was delayed due to weather. The heroic spirit was Caster, and you felt she looked familiar.
You were swallowed by the black mud. Although you survived with the help of your heroic spirit, you lost your memory again and changed your personality.
You were picked up after drifting to Yokohama. You said goodbye to your savior and began your daily life in Yokohama.
Intention: I don't know