Such a tough decision. So many different types of themes. I'll go with Natusme Yuujinchou. This アニメ is my all time お気に入り for a reason (story, characters, animation, and MUSIC). All the 音楽 is so amazing, all the opening and ending songs. But the 音楽 that is woven within is so beautiful and brings back the memories. <3 The hard 質問 is, which song to post from this series.