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Chika Arimura, who has a strong interest in multiple orgasms, invites two friends from the university to visit the multiple research institute. Masaki and others at Maruken are overwhelmed by Chika's enthusiasm and kidnap a man in the city for treatment. Chika, who was completely fascinated by multiples, brought her lover to Maruken... Multiple experience by 5 women for the first time in the series!