Sono Akuyaku Kizoku, Mama Heroine ga Suki Sugiru: Shinshi na Doryoku de Saikyou to Nari Fuguu na Oshi Chara Tasukemakuru

The mature female characters in this game were relegated to supporting characters, doomed to unfortunate endings. "Why...... must the cute mommy die?" Our protagonist spent days seeking a redemption route for these women, but he was disappointed when it didn't work out. However, one day, he was suddenly transmigrated into this game world as a villainous aristocrat who only appears on the bad-end route. The man who loves in-game MILFs, in order to save them (and himself), must find a way to escape certain death, while living a happy harem life!!!! (Source: Kadokawa, translated)