In 'Happa no Suizokukan', Daikichi Kawachi discovers Rin Kaga's passion for creating fish from autumn leaves one morning. To nurture her interest, Daikichi delves into the wonders of marine life with Rin. In 'Santa-san e', Daikichi and Rin gear up for their first Christmas with Santa Claus and his reindeer. 'Osora ni Mankai' finds Rin eager to witness the cherry blossoms with Daikichi, Kouki, and Yukari Nitani, but an impending spring storm threatens their outing. Following a summer festival in 'Kaeri Michi', Kouki's excitement prompts Daikichi to lead the group on an unexpected adventure before heading home.