I'm a thankful fox in Tokyo

Reborn on an island country, Higashino Yu became a wild fox. When he was about to have a mental breakdown, he found that he had a system with him.
He was stunned for a second, then he was ecstatic.
"The heaven and earth thank me! My parents thank me! I am a saint! I love the world! I benefit all living things! I am willing to take on everything! I will enjoy fame, wealth and power forever! I will receive fame, wealth and honors from the immortals! All laws belong to me!"
With the ambition of becoming a god, Dong Ye Yu plans to practice for decades, transform himself into human society, and achieve his ultimate goal.
Then, he suddenly discovered that the system had a small-print prefix.
"The gratitude system. Only by repaying a favor can you get a reward... In other words, I am the legendary gratitude fox?"
Dong Yeyu was silent for a few seconds, raised his head, and was speechless.
But I am a male fox!

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