Unexpected

After finishing the sealing formula she gathered chakra on her four fingers except the little finger and placed it on the scroll that was containing her formula. Then she placed them on the place between her brows. 

Nothing happened on that place after placing the seal. But with her sharingan she felt a little traces of chakra in there without blocking anything in her forehead. 

"You should focus on improving your mind eye of Kagura baby. Although it is an innate talent it doesn't mean it couldn't develop. Moreover excessive yin chakra use could be harmful so don't use shaingan frequently until became at least four years old since you are already big as four years old child." Yuna poked her forehead.

"Alright mom" she caressed the place she poked.

"Sealing is stable. It is very impressive. I did this when I was six years old. But you managed to accomplish it before the age I did, you surpassed me baby. Of course without my teaching you couldn't do that. But I couldn't deny the fact that my daughter is a genius." She proudly said.

"Mom, I'm hungry" Tsukiho weakly said after hearing her mom's bragging. 

"Then let's go I made something you like very much" she cheerfully said while pushing Tsukiho to the dinning table. 

Soon she was attracted by the smell that came from the bowl before her. "Ramen?!" 

"No it isn't ramen but it is something like ramen since I don't know how to make ramen. ya know" Yuna scratched the back of her head embarrassingly. 

"Thank for the food" she took the chopsticks and started to eat. "It's good mom" after the first bite she started to dig in.

At that time Tsunade who was left by Tsukiho also entered the kitchen with Shizune. "You little brat!" Tsunade growled at her while Shizune waved her hand and sat opposite to her.

"Hi Tsuna-chan, Hi Shizune!" She innocently greeted them before ate another mouthful. 

"Hehe" Shizune smiled as Yuna placed a bowl beside her.

"She did it" Yuna bragged about her daughter to Tsunade. 

"What?" She raised an eyebrow. 

"She made the yin seal" Yuna said playfully. 

"Haaaa" Tsunade shouted. "I wasn't here just for two hours" 

"Hehe" Tsukiho and Yuna both laughed at the same time. Tsumiki who was just entered the room was so frightened as he saw a ghost.

"Remember Tsuna-chan, I had this and mom was there to supervise me" Tsukiho smirked. 

"What are you talking about" Tsumiki also took his bowl and started to eat. 

"Our baby managed to write the yin seal formula and successfully created one." Yuna said proudly. 

"Really" he activated his sharingan and looked at Tsukiho's forehead and saw a traces of chakra was between her eyebrows. 

"Impressive baby. It is very stable. I can see it drawing almost all of your chakra to the seal." Tsumiki frowned. 

"It only for the first time." Tsunade also looked at the place between her eyebrows. "After it manifest like a diamond shape symbol, it will only takes a very small amount of chakra per a day. If a civilian had a yin seal it will take more that ten percent of her chakra as I tried on Shizune. It took almost of her chakra reserve so I had to remove it. 

But Tsukiho is an Uzumaki and with her chakra reserve, it will decrease to one or two percent of her chakra reserve. Even if she release it too much times continuously to the point the mark will be disappear in the future, the mark will reappear within few day while taking the same amount of chakra as it took usually. Which is about one or two percent or at most it will be three percent. 

But now she just made the seal so it will take whole month to appear the seal on her forehead. So for only this time she will be little vulnerable due to the yin seal since she couldn't use chakra to perform ninjutsu. That is also one of reasons that I am going to stay here for a while." Tsunade slurp the noodles.

When Yuna going to eat Tsunade stopped her. "I am going to check you after this. So you can't eat." Tsunade said in a smug voice.

"Hey!" She exclaimed but she calmed down and took a beep breath. "Well then, I am going to study. And come quickly" she glared at Tsunade.

Hearing that Tsumiki and Tsukiho also sped up eating to see the conditions of Yuna. 

Soon Tsukiho finished eating and washed the bowl. Ignoring the the feeling that she need another bowl and went to the study after Tsunade. 

She looked at how Tsunade use her diagnosis jutsu. And anxiously waited for her judgement. After checking out for several times Tsunade's frown became deeper as Tsukiho and Tsumiki's anxiety went to higher level as well.

"Yuna who is the enemy that harmed you?" She asked slowly yet her aura became murderous. 

"I don't know. But I know he is extremely powerful one." She showed a bitter smile. 

"I have never seen such type of chakra except from my grandfather. But this is way more terrifying than that and at the same time it was well hidden like it isn't exist in the first place. And it is very sinister and cold." Tsunade took a cold breath. 

"If I didn't inspect it closely I would have missed this. Like it blended well with your chakra. It corroding your chakra reserve and chakra pathways. An additionally the backlash of the technique you used ten years ago making it more worser. 

Even I don't have much confidence in curing this. If I can't cure this I am afraid you don't have much time left." when Tsunade said that the other two only heard a metal ringing sound as they felt the whole world vanished in to nothingness. 

"It was my fault!" Tsumiki collapse on the floor. "It was my fault. If I kill my self or didn't distracted that day this wouldn't happen to you" tears came out from his sharingan as he wept in front of everyone. 

"Oh Tsumiki it wasn't your fault. At that time all of us are very sad. How could we know someone take advantage of your moment of weakness and don't tell something like that ever again if you die, how could I even live?" Yuna hugged him and slowly patted his back.