Hattori Heiji is a gambler.
And he is almost victorious in every battle - with his superb reasoning.
However, every time he used that superb reasoning on his weak spot, Toyama Kazuba, it seemed to be ineffective.
That day, she said:
"Let's make a bet. Bet on whether you can save me alive today."
She said:
"If you win, I will take your last name."
She also said:
"If you lose, I will accompany you."
Intention: