Playing a Development Game in the Abyss? I Was Forced!

[Semi-invincible] [Half-growth] [No system] [Two souls in one body] [Fantasy] [Multiple heroines] [Slightly yandere] At the beginning, you fall into the endless abyss and become immortal. In addition to fighting with unspeakable monsters every day, you face eternal loneliness and boredom. Until one day, when Dunmo was bored and waiting for refreshment in his daily life, he unexpectedly sensed the existence from the 'outside' - some 'incomplete' boys and girls. Hmm... The cat-eared girl who has exhausted her magic power, the superpower who cannot break through, the swordsman who is rejected by ten thousand swords... This is much more interesting than those twisted things! Not enough magic? Then give it a fatal blow and become an assassin who can sing magic! Power card level? Develop horizontally and become the almighty king of the supernatural world! No sword spirit? With a mortal body and mortal skills, one can open the sky with one sword! He thought it was just a 'development game' to relieve his boredom, until one day he found that he could finally step out of the abyss! "Uh... Can someone tell me what's going on with those guys at the door who are clamoring to 'repay their favor' and 'get married'?"