Arisa Nakada

The battle against the forces of evil is nearing its end as the Undead King Leonis Death Magnus remains the sole survivor of the Dark Lords. Standing no chance alone against his enemies, Leonis seals himself deep underground with the goal of reincarnating a thousand years later and rebuilding his demonic army. Within the span of a millennium, however, everything has changed. People no longer remember the great war that led to Leonis' defeat and instead face a new threat—the monstrous creatures known as Voids. Magical devices have replaced sorcery, and humans with special powers—manifested in the form of weapons called Holy Swords—train at the Excalibur Academy to fight the Voids. Reborn as a 10-year-old human boy, Leonis meets Riselia Ray Crystalia, a dutiful girl who stumbles upon the ruins of his hibernation chamber. Believing that Leonis has amnesia, Riselia offers him guidance and enrolls him at the Excalibur Academy. Leonis still intends to take over the world, but he must first familiarize himself with a reality completely different from all he knows. [Written by MAL Rewrite]

This is the visual diary of Kiitarou's experience with youkai. He's a boy with a very strong spirit sense, but when he entered a forbidden storehouse, he was kicked out of his home. He soon found a new place to live, where he met a zashiki warashi (house spirit) named Suzu. He and Suzu soon began to attract all kinds of spirit creatures, starting with a nurikabe (appears as a wall that impedes travelers) and mokumokuren (appears as eyes in a torn paper wall). What kind of folkloric creature will he meet next? (Source: MangaHelpers)