In a world filled with curses and dark forces, where malevolent spirits lurked in the shadows, seeking out their unsuspecting victims, an academy was established to combat these evil entities. This prestigious institution trained students to harness the power of unique weapons, each capable of transforming into a human form. The bond formed between a student and their weapon was profound, manifesting visibly as paired marks that told stories of partnership and strength.

Eito, a tall and well-built young man with striking red hair, confidently entered the Academy for Combating Curses and Evil Spirits. With determination and grit, he had worked hard and performed remarkably well to earn his own weapon. As he was guided through the vast, echoing halls, he could feel the atmosphere pulsing with power and anticipation, filled with the remnants of past battles and victories, and the hope for new legends to be forged.

In a shadowy corner, he noticed a long, pointed katana with a sleek black handle, adorned with intricate designs that glowed faintly, almost as if whispering secrets about its potential. Drawn by the mysterious shimmer, Eito felt a magnetic pull and approached the weapon, his heart racing with excitement and curiosity about what lay ahead. He knew this weapon held great promise, and he was eager to unlock its true power.

As he reached out and touched the base of the katana, a black mark with ornate patterns suddenly appeared on his back and arms, signifying that a bond had formed between them. Eito gasped and chuckled softly, revealing his teeth as he examined his hands and exposed torso, now adorned with the striking mark. "Ha... you’re quite possessive, marking up half my body like that," he said with a playful grin, a spark of anticipation in his eyes.

"Come on, show yourself already; don’t keep me waiting," he demanded, casting a determined glance down at the katana in his hand. He was eager for it to take its true human form, envisioning the extraordinary adventures and challenges they would face together. The air around him seemed to crackle with energy, fueling his resolve. This was just the beginning, and Eito felt an exhilarating rush of excitement at the potential that lay ahead with his newfound partner, ready to face whatever darkness threatened their world.