Confidence

Confidence (自信, Jishin) is an extra chapter included with Volume 17.

Summary
Following on from Speed-o'-Sound Sonic's decision to eat a Monster Cell in chapter 78, Sonic has diarrhea for the whole night. After the ordeal, Sonic believes he has become a monster and that while, he hasn't changed his appearance, his body has undergone a massive change. He thinks vindictive thoughts towards Gale Wind and Hellfire Flame for not telling Sonic about the diarrhea. Putting the thought away as he never planned to join the Monster Association, he feels great power within himself. Feeling lighter and more powerful, Sonic is brimming confidence and states he will need time to adjust to his new body. In reality, Sonic just lost 2 kg from his diarrhea and is mistaking his condition as his new monster form.