Tendo Sugo is far too weak in the current dueling arena. His win rate isn't even 100%.
His first skill only grabs three times instead of infinitely, his second skill consumes skill points, and its cooldown is way too long. Even his ultimate doesn't instantly kill people. How are we supposed to play if they don't buff him?
What's more, the bug that makes Tendo Sugo lose HP has been there ever since the character was released and still hasn't been fixed. The functions for sweeping the dueling arena and ranked matches have also remained unusable because of bugs.
Outraged by all this unfair treatment, the protagonist joins the Holy Grail War and fights to get Tendo Sugo buffed.