"Due to My New Situation, I Have to Corrupt My Friend's Harem!" or "Friend's Harem Corruption" to make it shorter. This is a story where the MC is often overshadowed by others in the world, being seen as a secondary character, except for his exceptional intellect. The MC befriends Naoki, a widely adored individual known for his charm. Drawing upon his intellect, the MC assists Naoki in accomplishing something remarkable: capturing the hearts of specific girls and getting them engaged with him. However, one day, the appearance of a woman changes everything for both of them, damaging their relationship forever and ushering in a new chapter in their lives.

Play as the MC and use different tools and abilities to corrupt Naoki's harem! This story is basically a parody of the typical harem trope.