To give better context, the celebration of Tanabata is inspired by the Chinese Qixi Festival, based on the legend that this is the day when the deities and lovers Hikoboshi and Orihime are able to meet once a year from across the heavens, and thus the original olden Qixi Festival served as a Valentine's of sorts.
- Hoshino Hikoichi / 星野 彦一 - the "彦/Hiko" and "星/Hoshi" in his name references 彦星/Hikoboshi.
- Himeori Nayu / 姫織 七夕 - flipped around, 織姫/Orihime. Furthermore, 七夕 is straight up a reference to Tanabata (term literally meaning "Evening of the Seventh")
The original tale,
The Cowherd and the Weaver Girl is in itself is inspired by Chinese astronomy, when two stars (known in the west as Altair and Vega respectively) pass by each other from across the Milky Way once a year. Lovers who can only see each other for a brief time, not unlike our pair who can only briefly see each other for 20 minutes per day.
...but, is 20 minutes all the time they'll have, now and forevermore?