The Man Who Saved Me on my Isekai Trip is a Killer
MC is summoned in a different world, but is then abandoned and left to death as she wasn't supposed to be summoned dud to some treaty between countries. While she was walking down the street, some thugs approach her. Of course they try to rape/kill her, but the ML pops up and kills the thug. The ML is a psycopathic killer who takes her in and fucks her claiming that she is his, and calls her sister.
Uruwashiki Shuen
Classmates stuck in an apocolyptic city. Strong one had a crush on the weak one for a while, but weak one has a girlfriend (who beacame a zombie and s knows but not w) and he is searching for her. He gets bit by his gf who dies by s, and s chops w's arm off to stop the infection. Now s lives with the traumatized w. Its so good
A Second Goodbye to You.
Went to friends funeral, dound out he was murdered and his skeleton was hidden in the art room where they ahd club activities. Finds a painting of his, and the murderer hits him and he travels back in time to when Sora was alive
To the Sea