これはチョコレートを渡せずに部屋に持ち帰って独り食べながら「あ、このチョコおいしい...自信作」とか感想を述べるプリンツオイゲンちゃんを幻視して描いたけど精神(こころ)がもう息苦しかったやつの本来の流れの世界線

This is that "my soul feels suffocated from visualizing Prinz Eugen-chan who came back to her room with the chocolate that she couldn't give. While eating alone, she made remarks like "Ah, this chocolate is delicious... My pride and joy" thingy's true world line.