Every year, children in schools all across Japan take part in a sports day. It's one of the most important dates on the calendar, not just for the students, but for their parents too. This time on Japanology Plus, our theme is school sports days. Our main guest, sports writer Masayuki Tamaki, talks about their history, how they've changed, and their future. And in Plus One, Matt Alt follows a family as they prepare for, then attend, a primary school sports day.

About 20% of all the world's aquariums are found in Japan. Many feature unique specialties, from jellyfish to frozen river scenery. Others borrow techniques from Japanese garden design. This time on Japanology Plus, our theme is aquariums. Our main guest is Hajime Nakamura, an "aquarium producer" who explains why these aquatic utopias are so enduringly popular. And in Plus One, Matt Alt goes behind the scenes at the Sumida Aquarium at Tokyo Skytree Town.