Well done OP. This means you are not a retard.
No, the series doesn't have yuri, not really, people just love to see it everywhere anyway. More than one female character in a series? OBLIGATORY YURI TIEM!
Last episode definitely has elements that could be read as very suggestive of a deeper subtext to Yasako and Isako's relationship.The scene where they walk towards each on the steps I read as simply a moment of close personal connection, but a lot of people will see "Zomg lesbians" In Yasako's conversation with Haruken she talks about the idea that the feelings that created Miss Michiko, which she and Isako shared, were a little like first love. For me this scene focused much more on the potential future relationship between Yasako and Haruken, and simply explored the idea that the connection that she and Isako felt could be like "first love", not that it was first love. Haruken being the one to suggest love to me reads as a tacit reciprocation of Yasako's earlier confession to him<--- Lastly, I can get how people might have got a yuri vibe from this scene (pic related).