Gravity Girl Shining

"The weak me from the past is dead. The me now is terrifyingly strong!" Reborn in Tokyo and awakened to a System, Hibiki Uehara of Class 1-A at Haneoka Middle School secretly vows that this time around, he'll make a ton of money, fall in love, and become a winner in life. He still has no idea what that mysteriously appearing giraffe is, but with the System on his side, he can pursue girls, awaken their "Sparkle," and earn "KirakiraDokidoki" quest rewards. His future is sure to be bright! It just hasn't occurred to Hibiki Uehara yet that every Sparkling Girl recommended by the System has something extraordinary about her, and each has a unique special skill. Their gravity and depravity are truly astounding, and their secret practice room will bring him some unexpected surprises.

PS: Male protagonist, genuine harem, no romantic angst, no love-triangle betting, and he builds a harem from a position of overwhelming strength. Set in the BanG Dream! universe, mainly focused on [MyGO + AveMujica], with the occasional appearance by veteran BanG Dream! characters and occasional crossover characters from other works.