When Kannin walked downstairs, he looked to find his mom, but it seemed she had gone out. There was a note on the kitchen counter that just said:
"Gone out to do errands, be back later."
Kannin shrugged, his mom usually had to run errands, so it wasn't that unusual. He grabbed a snack from the icebox before heading out to town himself. Today's agenda was to go visit Kushina again to see how things were going with the Hokage-to-be.
Meandering through the winding streets of Konoha, Kannin could hear the laughter of children echoing from the playgrounds, the clattering of dishes and silverware from the restaurants, and the chatter of people going in and out of the shops. A fresh wind and bright sky greeted him, and he strutted without a care in the world, seeing his home at peace, for now.
Making his way to Kushina and Minato's home, he saw a number of people milling about, mostly the ones ensuring the security of the building before the big day. As he approached the door, he was stopped by a gloomy looking guy with a scar running across his nose, and he said with a gruff voice:
"Stop. State your business"
"I'm just here to see Kushina is all." Kannin said
"Kushina isn't seeing any visitors right now, so go away, or I'll make you leave." The man's face darkened saying the last bit.
"I appreciate your dedication to your job," Kannin said, "but trust me, I'm the farthest thing from a safety hazard when it comes to Kushina."
"Kid," the man started exuding a chakra pressure, "if you don't walk away right now-"
"Leave him alone, Arai." Kushina said from behind him
Seeing Kushina, Kannin smiled, and walked fun the man called Arai and said hello to Kushina.
"What are you doing over here?" Kushina asked
"I just wanted to know how things were going getting ready for the big day tomorrow." Kannin replied.
"Well," Kushina sighed, "things are a little hectic, as you can see."
"Does the whole Hokage's-wife package include the uptight doorman for free?" Kannin joked.
"Don't rag on Arai too much, Kannin," Kushina said, "he's got a job and he takes it seriously. Had you been anyone else I probably wouldn't have let you in."
After sitting down, Kannin asked her
"I imagine Minato's pretty busy, huh?"
"Yeah," she said sadly, "he's been in and out like crazy these past few days." She paused for a moment before she quickly looked up and said "Oh! I just remembered. Minato said to give this to you if you came around,"
Kannin saw her get up and rummage through one of the kitchen drawers, before producing a scroll. She walked back over to the couch and handed it to him and said
"Minato said to give this to you, since he wasn't able to give you a present when you became a jonin. There's one condition, though."
"Yeah?" Kannin said
"You can't really tell people about it, he kinda bent the rules to be able to give it to you, now that he's Hokage and all. He also said to tell you that you deserve to have it, both just due to your smarts but also because it's important for you to know who you are."
Hearing that last part, Kannin looked at the well kept scroll with more interest. How could this help him know who he is? The scroll looked like a typical jutsu scroll, with tan paper and a colored border, but where normal jutsu scrolls would have a color representing the chakra nature of the technique--yellow for lightning, for example--this one had a color for a type he didn't recognize, a steely grey.
Unfurling the crackly paper, Kannin understood why it needed to be kept secret: within this scroll were the directions for none other than the infamous Flying Thunder God jutsu. Looking over the scroll without daring to blink, he absorbed the information, astounded that Minato would allow him to learn such a powerful and dangerous jutsu.
"Minato said he was going to teach his Anbu the basics of it to help them maneuver better," Kushina said, "but he's entrusting the whole of it to you, Kannin. He said that you deserve it more than anyone in the village does. Use it well."
Kannin's head was swirling as Kushina was talking. What does Minato mean by that? His head was also swirling due to the complexity of the jutsu. He knew the Flying Raijin was difficult, but it was on a whole other level. Kannin wasn't sure he'd be able to learn it in a year even with shadow clone enhanced study.
The basics of the jutsu are easy enough; in fact, it's quite similar to the fuinjutsu he learned under Kushina. You make a personalized formula for the jutsu, and that formula is linked across space and time, allowing you to instantly travel to any mark you have within an effective range dependent on your skill level. This already had its caveats, teleport wrong, and you just might end up in an eternal void between space, but the hard part was everything after that.
The jutsu required you to have basically an eidetic memory of every formula you place to make sure you don't accidentally send yourself into another country. Thankfully, Minato also supplied another jutsu the Nidaime created with it that creates a mental register of the exact locations of your formulas in space, even if they move. Moreover, you needed to be, to quote the scroll, "attuned to the fabric of spacetime" which apparently took Minato a few years to fully get down, and the Nidaime only needed a year or so.
Kannin didn't fully understand what "attuning to spacetime" meant, but he knew he was going to figure it out soon. This, compounded with the other two techniques he wanted to learn were going to take a while, so while he wasn't going on dates with Warai, it was likely back to Shadow Clone crash course for Kannin.