I can't seem to find the spring special (episode 13.5) of season one: "Shakugan no Shana Special: Love and Outdoor Hot Spring Tutorial!" (Shakugan no Shana Tokubetsu Hen Koi to Onsen no Kōgai Gakushū!)
Mentioned here: https://en.wikipedia.org/wiki/List_of_Shakugan_no_Shana_episodes#Shakugan_no_Shana_(2005%E2%80%9406) https://www.anisearch.de/anime/4000
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