MTL - My Sister is Very Obsessive - Chapter 1 : My sister is very younger

With a marriage contract forcefully done, he married her, and all she could do was comply, and resent him deeply for that and for all the following misunderstandings they faced.
However, it was already too late when she understood she actually loved him.

“Only by enduring 2¹⁴ trials can one awaken the ancient power sleeping within the Key of the Star Prison, and become the most powerful being in the universe.”Timothy, the youngest Demon Lord in the history of his race, saw these words emerge after he touched the Key of the Star Prison, the most powerful artifact of the demon race, handed to him just before the old Demon Lord's death.According to the demon race's records, no Demon Lord had ever achieved this.However, over a span of a hundred thousand years, Timothy had easily passed 16,383 trials.Now, once again, he turned the Key of the Star Prison, and an unknown force mistakenly sent him to a brand new world, transforming him into an unknown and seemingly worthless demonic cultivator disciple.And the formidable opponent he was about to face in this world was the powerful Goddess Sylvia.When Goddess Sylvia received the challenge Timothy handed her, her cheeks flushed...“My dear Sylvia, I want you to know how deeply I love you. My heart belongs to you, now and forever.”

Kuro Aku was a high-schooler who one day bought a game because he liked one of the characters on the cover.

To his great surprise, that game turned out to be an otome game and the character he liked was the villainess who was destined for a bad end!

He was desperately playing through the game in search of some sort of way to save the villainess but he died in an accident before he could achieve that, and got reincarnated into the world of that very game by a selfish being who began calling him its toy!

In a different world, before the proper game started, and as a side character who doesn't even have a name fueled by a firm conviction to save the tragic villainess, he won't stop at anything to ensure her happiness!

Is saving the villainess even possible?

And what does being a toy of the mysterious being even means?

Read now to find the answer!

Former title: Reincarnated into an otome game and becoming the attendant of the villainess - For my master, I'm ready to even kill the heroine

“VILLIAN!? Is that what you call me? Do you know what I have been through?

FATE dealt me this hand, and I'll find peace in it. Even if I have to end the world, I'll sit a king on its ruins.

I'm not a good guy. I won't even pretend that I am. But then again, who in this world can truly claim that title?

At least I know my heart. What about yours?”

.....

Chiron lived an unfortunate life, but his problems only got started when he was reincarnated in his dangerous Hit novel.

Behold, a lesson to all authors... MC's have it difficult too.