The 10,000x Return Martial Tycoon

Logan Lowe obtains the Gift Return System, granting massive resource returns when he gifts items to high-rated girls. For his sick younger sister's medical fees, he invests in multiple girls, gaining massive resources and advanced martial arts. His strength surges. He encounters Rift Invader Faction armies in the Rift Dimension, turning the tide and becoming a genius martial artist guarding Huaxia.