I still remember it. On that day, I felt anger so strong that my guts were boiling and excitement so strong that I was going crazy... I had been married for 23 years, and until that day, I had never sensed any sign of a man in my wife's life, and I could confidently say that she had no interest in any other man than me. However, one day, when I held a "Suginami History Club offline meetup" at my home, which was a gathering of members I had met through my history hobby, I witnessed an unbelievable scene where anger and excitement crossed paths so much that I forgot to breathe...