Koichi believes it's important to pass on good habits he's learned from others. He's always made a point of choosing low-calorie foods for better health management, but the tuna can Keiko brought home that day was different from usual. The can was slightly larger, and its appearance was a bit unusual too. He might come across as childish, but this was all for his beloved. Koichi realizes that even small choices in daily life can make a big difference.