With the school's cultural festival approaching, Subaru, who is making a planetarium with Minato for the astronomy club, offers to look after the fragments while the cosplay club hold their activities. While testing out the planetarium, Minato brings Subaru into outer space, taking her on a tour of the universe. During the trip, Subaru recalls how she once experienced something similar when she met a boy in hospital, which is revealed to be Minato.