Nishina Shiho, is a young mother and raises her child while working as a writer at home. Although she enjoys her life and has a perfect husband, she is troubled by her lack of sex with her husband, Kosuke, who has ED. Due to this, Kosuke suggests that they attend a "couple exchange party", where couples change their partners for various reasons.

• Aimi Satsukawa
• Kento Senga
• Manami Hashimoto
• Yurina Yanagi
• Masanari Wada
• Maho Nonami
• Yuma Ishigaki
• Yuka Itaya