"Dangerous oni lurk outside, so you must never leave the mansion."
Raised under the protective wing of your loving father, you've always heeded these words and stayed safe inside. Life in the mansion may be comfortable, but you wish that you could experience the outside world just once.
One day, your wish comes true, but with a huge twist. The mansion suddenly comes under attack and you're abducted by three handsome oni. What they want is the Hallowed Treasure, a legendary gemstone that was lost 20 years ago - yet you've never even heard of it.
The Hallowed Treasure is said to grant any wish to the person who possesses it, but just where could it be? Will you also be able to discover the secret behind your existence? Only you hold the key to determine whether this quest ends in hope or despair.
"I won't tolerate any selfish behavior. You're my property now."
The leader of the oni group that took you from the mansion, Tamaki is a total alpha male who's not afraid to be bossy... or so you thought. Sometimes he reveals a kinder side, making it difficult to judge his character. While Tamaki may be strict with others, he's even stricter with himself, honing a work ethic admired by other oni. Despite your circumstances, you're quickly charmed by his kindness and sense of justice. Can you help him to overcome the darkness within his soul?
This seemingly cold-hearted oni loathes humans, making sure to keep his distance when you first meet.
"Listen well. If you don't want to die, then don't come any closer."
But despite his hostile words, somehow Senri is always just in time to save you from danger. You soon notice that hidden underneath his cold demeanor is the heart of a kind young man. What could have driven him to hate humans so deeply? Can you teach him to open his heart?
Warm and gentle, Hisui is a welcome presence amongst the chaos of your new life. Unlike his companions, he's always there to greet you with a kind smile, but you occasionally notice a certain sadness in his eyes.
"I love you. So please, as long as I'm here in this world, don't ever fall in love with anyone."
His futile request fills you with sorrow. Can you find out the truth behind the troubled past that led him to make such a wish?