From October 1 to October 31, 2025, first-year doctoral student Ikuma visited the research group of Director Komatsu at the Max Planck Institute for Astrophysics (MPA) in Garching near Munich. During his stay, he presented his own research on the cosmic microwave background (CMB) and exchanged ideas on related projects and analysis methods being pursued at MPA. Through group meetings and individual discussions, he received concrete advice on his ongoing work. He also gave an internal seminar at MPA to present his research. This visit provided him with valuable insights that will be beneficial for his future research.