Sakiro and his ex

In the high school of shinjiku Sakiro was facing social anxiety and depression as he suffered from his break up. He was depressed and mocked by his gf till one day he watches dragon ball randomly that motivated him to change and then he went absent for 3 months and when he returned he had golden rings on his fingers and a bracelet, he was taller than before and more muscular and confident. he had his hair coloured blonde