Detective Conan: Death Note - Chapter 250: There Are No Rules or Morals, Only Power and Ability

The MC entered the body of the An family eldest son, An Ziran, an arrogant 16 years old boy who weighed 78 kg (~171-172 lbs), who only knew how to eat, play and sleep. Seeing his current body, An Ziran decided his first priority was to LOSE WEIGHT!

A firefighter in her previous life, Li Jing’er transmigrated back to ancient times and became the wife of the second son of a farmer. A month after Li Jing’er married into the family, her husband left to join the army.

Then news arrived that her husband was killed in battle but the compensation paid by the imperial court was snatched away by her greedy in-laws. Forced into a corner, she planned an escape, severed family ties, and left with her six-month-old baby daughter.

Joining the flow of refugees escaping from disaster and war, she picked up several lost and abandoned children along the way and tried to start a new life.

Then out of the blue, her deceased husband appeared…

- Description from Novelupdates

The youngest princess of the country of Stellaus, Marietta, was betrothed in a political marriage to the General of the great militant country, Oltaire. General Belvant was often said to be strong, a fierce and terrifying god of a warrior. On the other hand, Marietta was a delicate flower of a princess. Everyone felt pity for poor Marietta’s situation, however, the truth was that Marietta found the General very dreamy… The story of a 30-year old General with a scary face (who was actually quite nice), and the tiny and adorable 18-year old Princess in their times of conflict and of lovey-doveyness.

A girl who calls herself a demon appeared before a timid student named Fumio Kijima. The girl claims to be a campaign girl from the demon world and she gives him the ability to “summon a room” from nothing but thin air.

At first he doesn’t abuse his power and uses it as a convenient ability in his every day life. But one day he is bullied by his classmates under a false pretext and is made to suffer. In the past he would have wallowed in misery and cried himself to sleep, but now he had a power to call upon.

“I will make them regret it!”

Using his powers to summon his “room”, he begins his era of confinement and brainwashing to achieve his goals.