This novel main plot would about the MC that got memories from another world when he was sick. As he in despair to realize that he could be just a background character in this world so he feel alive to be able stealing or get those heroine from protagonist.
That's why in this novel, so there was a chance could be blackmail, manipulation, non-consensual stuff.
I'm using japanese name order - family name - first name -
MC :
Suzuki Kouta
Appearance : He is just like Astolfo from FGO, but he had short hair and gray.
Harem in my mind / in early chapter : MC focus made Visual Novel: FSN
Sawamura Spencer Eriri : Saenai Heroine no Sodatekata
Kasumigaoka Utaha : Saenai Heroine no Sodatekata
Kato Megumi : Saenai Heroine no Sodatekata
Kitagawa Marin : My Dress-Up Darling
Sajuna Inui ( Juju ) : My Dress-Up Darling
Tachibana Satomi : Dumbbell Nan Kilo Moteru?
Next stage: MC expansion to other bussiness? Maybe
Takao : D-Frag
Shinomiya Kaguya : Kaguya-sama: Love is War
Fujiwara Chika : Kaguya-sama: Love is War
Iino Miko : Kaguya-sama: Love is War
Hayasaka Ai : Kaguya-sama: Love is War
Nakano Ichika : The Quintessential Quintuplets
-------------------------------------------------------------- Put in hold
Senjougahara Hitagi
Kiss-shot Acerola-Orion Heart-Under-Blade
Kanbaru Suruga
Hanekawa Tsubasa