Heroic spirits, celebrated for their achievements, become heroes. Accidentally traveling through time and space, they gain access to the Heroic Spirit Achievement System, where their deeds are solidified into attributes, abilities, and skills... Slay demons and gain demonic special attacks. Slay dragons and gain dragon-slaying treasures. Steal a nation and gain weapons to plunder. Slay gods, slay demons, and confront three thousand worlds... The starting world is Demon Slayer. Expected storyline: Slash Akame no Yaiba, a comprehensive world of Warring States-era monsters (Inuyasha, Nura, Sekiro, Oda Nobuna, and more). P.S.: This is not a nerd's guide, as it contains alternate settings, so please don't read too closely... Thank you for your support! Even if you haven't read the original work, you can still read it as original...

"We have discovered one of the oldest families." "Yes." "This family has been around since the beginning of the world. Its members from ancient times to the present include Anastasia, the last princess of the Tsarist Empire, Joan of Arc, the protector of France, the two talented women of the Heian period, Murasaki Shikibu and Sei Shonagon, and the British witch Morgan le Fay..." "Yes--!?" "In addition, we have discovered something." "This family has a humanoid treasure that has been passed down to this day-each generation will enter into a marriage relationship with these 'members'." "???"... People in Type-Moon get the family simulation period and can trace back to the past to add bricks and tiles to their own 'bloodline'. But in the end. I found out...I have become the ancestor of this family?