Chichiri, a wandering monk by trade, wears a special mask and everytime he talks, he likes to end the sentence with a "no da". How his scar came into being is when Chichiri was young(18 years-old) and very much in love with this girl. One day, Chichiri goes to meet up his best friend but he sees his best friend and his love kissing. Chichiri becomes angry and he and his friend end up fighting. Chichiri killed his friend while he is left with a damaged left eye. Filled with guilt, he keeps his scar to remind himself of what he lost and he wears the mask to hide it. Also, you may notice that Chichiri takes off his mask mostly at serious situations.
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