Hybrid Derecho (a Touhou LW original) refers to a derecho that possesses the traits of both a serial derecho and a progressive derecho. This is the crazed temperament of this world's Reisen, who connects the Moon and Earth while continuing to strive forward. Reisen's temperament has been fully reconstructed. She brings together the moon rabbits and earth rabbits, and the essence of her being is predominantly made of the temperament of rabbits, Wood Phase (strong against Water Phase, but weak to Metal Phase). Reisen's Lunatic Bouncer, which strikes the earth with gravity-defying force, and her Lunatic Smartgun, which can pierce through the phase of any object, have the potential to go beyond the laws of physics and disrupt the order of the universe (strong against Sun Essence).

The ability of Reisen Udongein Inaba, who has almost reached the end (a Touhou LW original). Reisen completely lost this ability due to a Lost Word. She is currently regaining it little by little, though not through restoring or replicating her old ability, but with a newly constructed original ability that formed a core to build upon. She has continued to travel across worlds to try and end the Lost Word Incident. There are perhaps few people with as many acquaintances as Reisen Udongein Inaba. She may even be on par with Reimu Hakurei. Originally, she lived on the Moon as a soldier. It seems many moon rabbits have no name, so the fact the Watatsuki sisters gave Reisen her name and adopted her as a pet might make her extremely lucky. The origins of the moon rabbits are still a mystery, but there's a theory that their ruler, Chang'e, ascended to the Moon from the Earth. Since there also exists a theory among moon rabbits that she was lifted to the Moon, perhaps they and Chang'e moved there like Tsukuyomi and the other gods. When war later broke out, Reisen fled down to Earth. Whether a war really did take place is unknown. After fleeing, she arrived in Eientei, which, unbeknownst to its inhabitants, had become a part of Gensokyo. Eientei would later be thrust into the spotlight by teams of humans and youkai in an event that all began with Reisen receiving a telepathic message. The message contained clues that the powers of the Moon sought to escort Reisen back to her former home. In response, the Eientei elites initiated a plan to steal the true Moon, which led to an incident. In reality, however, it was the teams of humans and youkai that escalated things into an incident. Since then, Reisen has been selling medicine in the village and getting involved with the incidents and general disturbances that occur across Gensokyo. It's thought that Reisen acts solely on Eirin's orders. When she saved the Moon from danger, Reisen went toe-to-toe with the most powerful sworn enemies of the Moon. Reisen is who she is because of a complex web of countless strange twists of fate. Recreating a person like her is exponentially more difficult than it would be for a regular person. Doing so may take longer than a lifetime of the universe. What's more, processes that take an infinite amount of time are theoretically possible, so there are problems that can't be solved no matter how long you have. "If I could only find Lady Kaguya, I could use her ability to fix everything..." In response to Reisen's desperate prayer, a white rabbit came flying toward her, who presented herself with the confidence of someone who believes themselves a god. Reisen's Lunatic Smartgun and Lunatic Bouncer are a pair of weapons formed by the concept of the Horned Rabbit Union that, in a sense, represent her complicated circumstances. The Lunatic Smartgun was made with Lunar technology and has a user-recognition function. On the other hand, the technology used to make the Lunatic Bouncer is a total mystery. Despite its appearance, it contains Earth minerals from the Age of the Gods. In other words, these two weapons were made in completely different ways. Their specifications differ by a staggering 99.999999999%. Under normal stances, they would never be compatible, but when Reisen uses them, they work together seamlessly. Using the moon rabbits' telepathy, the Lunatic Smartgun can establish a link between itself and Reisen, and the Lunatic Bouncer can communicate with Reisen through their shared connection to Tewi. As a result, these two unrelated pieces of technology can work together using Reisen as a connective wire.