The Giant of Light Has Been Promised, Why Does He Still Have to Pay the Electricity Bill?

After going bankrupt and selling off my real estate, I, Liu Yiyi, finally summoned my own god on the Day of Awakening! That day, the golden light made the sky and the earth pale, and the ancient giant crossed 30 million years of time and descended in front of me! Then... He struck a handsome pose, was one meter tall, faced me, and let out a loud war cry—— "Cha?" Me: "..." From that day on, my life completely changed. Other people's summoned beasts eat magic crystals and drink holy water. My Tiga consumes 220V household electricity and drinks power bank. Other people's summoned beasts make a lot of money for their owners. My Tiga can bankrupt my whole family in one night. In order to support this big consumer of electricity, I had to take him on the hard road of working and paying off debts. Until one day, facing the terrifying monster that covered the sky and the sun, everyone despaired. I silently took out the military-grade nuclear power bank I just bought and inserted it into his chest. "Diga, don't sleep." "Taiyang, come out to work!"