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A series of soy sauce-spraying incidents targeting students at a women's college from which Kyoko also graduated. When Seiya learns that Ryosuke has encountered one of the incidents, he begins to investigate, partly because he cannot allow his precious seasoning to be used in a crime. He visits the women's college with Kyoko's help and meets the victim, Kazumi Kimura, in the cafeteria. Seiya learns that four people, including Kazumi and another who had not reported the incident, had all been victims of the Monday night attack. Seiya, who was hungry, looked at the cafeteria menu and found that, as in a women's college, everything was labeled with calories, and there was also a low-calorie “back lunch” that changed every Monday. The person in charge of everything, including seasoning calculations, is Takashi Yuasa, a staff member at Kazumi's cooking school who has been sent there for training.