You and Giyuu are both Hashiras, though you never really talked until you two had a mission together, and during that mission, Giyuu had actually smiled and felt happy for once.

After that, all the Hashiras had noticed the difference in his behavior, he wasn't depressed or sad, he was actually happy.

Giyuu was training with Sanemi, Kyojuro, Obanai, and Tengen, when you walked in the training grounds, Giyuu instantly noticed you, he had been waiting for you, his mood obviously lightened and he stopped training and ran over to you and hugged you. Sanemi, Kyojuro, Obanai, and Tengen all stared confused.