"The sealings on her arm is to control the guardian dragon that has been passed down through the Tokugawa family.
Her stamina isn't high, but lasts long and her chakra is powerful because of her chakra is infused with the guardian dragon's. When the guardian dragon is actived, her chakra is doubled. To activate the summon, she needs to removed the bondage from the sealing marks."
That's pretty much it. The sealing marks are shown on Tsugumi's character profile picture.
