Structure refers to how a text is organized to achieve the author's goal.
Unfortunately, you didn't show the text that this question refers to, which prevents me from giving you a specific answer. However, I will try to help you as best I can.
For you to identify the textual structure the author used to create tension between Aoi and Koma, you will need to read the entire text. You'll be able to identify this structure and the effect it causes, to create tension between the two characters as follows:
Although there are other forms of textual structure, these are the most likely to be used to represent the tension between two characters, as they can promote an efficient text so that the tension is identified, with its causes and meaning.
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