Most people might consider single use scrolls to be inferior to wands and staves. Generally, they would be right. There was no spell he could put on a scroll that he couldn't make into a wand. So, why make scrolls? For one, it took a minimum of fifty times as much mana to produce a wand. Mana that he was required to have on hand while making the wand. Mana he definitely didn't have. So he could, instead, make fifty scrolls to one wand.
There was another reason though. Scrolls didn't have to be made all at once. As long as he had the proper supplies, it was technically possible for him to spend the time and mana making a single scroll capable of blowing up all of Japan. Obviously that would take an ungodly amount of mana and was very inefficient for him at this time. However, a few scrolls capable of hurting something along the lines of a mid-class devil? A day of work, tops.
Then there are all the simple little utility things he might only need once in a long while, in which case having a wand for that spell was silly. For now he was taking some inspiration from the D&D franchise and some books he'd bought with spells in them. While he was aware of such things in both of his lives, he'd never really studied them in depth or anything. So, inspirational sources were a necessity. He'd still make simple elemental attack scrolls, those were always useful. But another useful spell could be Dominate Person, a spell that let him turn someone into his personal minion for a short time. Hit someone threatening him with that spell and tell them to run as far away as they can, while he did the exact same thing!
So, yeah, he planned to make a few dozen scrolls in his spare time and carry some on himself at all times. He had his priorities straight and priority one was survival! He couldn't do anything if he got himself killed by the first weak ass supernatural entity he encountered. Or god forbid, a stray coming into his city. And now that he'd thought of that, he felt like he'd tempted the great Murphy in the sky. A good weapon was definitely next on his list!
Junichiro jumped and felt his heart suddenly hammering in his chest as his proximity wards were tripped. He quickly hopped to his feet and grabbed a small hand mirror. Instead of his reflection he saw the front gates of the junkyard. As soon as he looked he let out a sigh of relief, "Way to work yourself up over nothing, dumbass."
Sitting in front of the gate to the junkyard was a deliveryman dropping off a few packages. He watched through the security mirror until the delivery man left. The security mirrors were part of his upgraded ward scheme. He had small mirrors all over that all linked to the hand mirror. With a touch he could scroll through all of them and get many views of the surrounding area. He generally kept it focused on the front gate though, just for moments like this when his deliveries arrived.
He quickly made his way through the maze of junk and broken down cars until he arrived at the last turn before the main gate. He looked through the security mirror once more and flipped through some of the other surveillance mirrors to make sure no one was nearby to see him. With the coast clear, he came out of his hiding spot and quickly went toward his packages. He carried the boxes back through the maze to his work area slash home. They weighed a bit but he'd started working out some to beginning improving his strength. He just considered this another work out.
Once safely in his shed, he grabbed his knife and sliced open the packaging. After pulling out the items, he gave a little cheer. It was several pieces of dark tan, nearly black, leather and a variety of leather working tools. He starting setting them up in his tailoring station with a bright smile. He'd been meaning to make himself a bag for a long time but he needed to make the bag from scratch if he wanted to enchant it. Oh yes, he was very much looking forward to making his very own Bag of Holding. Or, Backpack of Holding, as the case may be.