Straightforward version (you can skip this and go straight to the unlocked version below):
Seven years ago, during the “Lost Christmas,” Sakurai Shu was a direct participant and the sole survivor. He lost all his memories.
Strangers pitied him, those who knew the truth hated him, and his only remaining family could do nothing but silently wail with him in the dead of night.
Then one day, Sakurai Shu encountered, in a dream, a treasure guarded by a beautiful purple crystal.
His miracle.
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Unlocked version
At seven, Sakurai Shu was very pleased with himself. Already deep in his chuunibyou phase, he caused a ruckus wherever he went, and somehow managed to dream himself a wife.
A slender waist, long legs, fair skin, and stunning looks. Gentle and capable, she'd chase after him and say, “Shu is super cute.” Sakurai Shu was even more pleased.
Ten years later, he met someone who looked just like his wife's older sister. At last, the true nature of the lovesick yandere, sweet on the outside and dark within, was laid bare before his eyes.
Sakurai Shu, run!
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[Important]
1. Mana really does take part in Shu's entire growth, and yes, she's the love interest.
2. The anime plot has been changed a lot. We absolutely need a happy ending.
3. Mana is a bit (emphasis on “a bit”) out of character.
4. If you know about their relationship, please don't scream too loudly. I don't want the story to get taken down while I'm writing it (sob).
5. Updates are irregular and depend entirely on my three-minute bursts of inspiration.
6. If you don't like it, don't read it. Let's part on good terms.
Theme: The king will eventually reclaim his treasure.
After waiting for so many years, I finally saw an article. Mrs. QwQ supports it!!!