Baka to Test to Shoukanjuu‎ - Volume 9.5, Special Bulletin: Ironfist-senseis Life Counseling Chatroom (Part II)

Jun Xie was the number one assassin in modern earth. His skills and knowledge in the field of assassination were unparalleled, his accomplishments unprecedented, his reputation terrified the entire underworld. However, during a mission to retrieve a mystical treasure, a mishap occurred…

He is now Jun Moxie, a sixteen year old super level debauchee, sole heir to the declining Jun family. A family of valiant heroes, left with an old grandpa, a crippled uncle and a debauchee as the sole heir! Accepting the world’s criticism and cold stares with a smile, his new journey begins! His life will be carved by his own will! Rise to the top! Evil Monarch Jun Xie!

“This cup I toast to those I’ve killed in my past life. Forgive me, for there is no chance for you to have revenge. Gulp!

This cup I toast to those whose life I will take in my new life. Forgive me, for you are fated to die by my hands. Cheers!”

- Description from novelupdates

She comes from the top of Zhongshan Mountain, she is covered with frost and snow, she is unparalleled in beauty, but she has no talent for “love”, and she likes nothing more than a cup of tea in her life, watching the excitement.

It is said that she was young and ill-fated, with a weird personality, but in fact, she can also be obedient and docile, with a smile like a flower.

It is said that she has a mean tongue, arrogant and rude, but in fact, she can also smile sweetly and be gentle and amiable.

but–

She… is… is… no, happy, willing!

Until that day, she met a boy.

Half of the city is full of wind and moon and half of the city is snow. All the scenery in her life are brilliant because of him.

…

- Description from novelbuddy

Untolerated by heaven, a boy was restricted by the most powerful spell.

Amamiya Hiroto is unlucky. His life consisted of misfortune after misfortune, culminating in an unlucky death during an incident on a school boat trip, trying to save a girl he barely knew. After death, he met a god of reincarnation who requested that the hundred or so dead passengers—one of them being the girl he tried in vain to save—be reincarnated into another world.