Anata wa Warui Hito

"From all appearances, that customer seems to be the type of person who's truly good to the core, and as hard as I tried, I couldn't bring myself to be annoyed at him..." Sachi works at a hostess bar as wait staff and absolutely hates people who most would consider to be "good-natured". He hates one particular male customer above all -- Sasagawa, who is anything but your ordinary "good person." He bumps into Sachi and nearly makes him spill alcohol all over himself. Sasagawa protects Sachi and even goes so far as to try to tip him. Sasagawa's kindness has everyone spellbound. Sachi, however, refuses to be fooled by people like Sasagawa. Why does Sasagawa's kindness give Sachi the sinister urge to sc*** him over...?+