This digital gaming platform presents players with Hanafuda card competitions where participants clash to establish the twelve celestial animal representatives. The gameplay adheres to the traditional Koi-Koi system, with competitors accumulating points across three consecutive rounds to determine victors. Success in these matches brings players nearer to achieving zodiac status within the ranking system. Participants can nurture their Zodiac Girls through active participation in matches and accepting reward items. As these character levels advance, users gain access to diverse audio content, visual presentations, designations, and decorative elements that enable personalized configurations and amplify the competitive atmosphere. The platform delivers straightforward rule documentation alongside training facilities designed to assist newcomers in grasping mechanics while ensuring enjoyable experiences. This Hanafuda application facilitates live international multiplayer encounters, implementing standard Koi-Koi protocols and presenting multiple engagement options such as the Zodiac Girls Challenge, Companion Competition, and Training Rounds. The roster showcases distinctive Zodiac Girls, notably featuring the inclusion of the feline representative among the twelve traditional signs. Enthusiasts can pursue the Zodiac Girls Challenge while striving for premier zodiac classification. Renowned voice artists contribute character performances, and users obtain supplementary audio and visual content through gifting mechanisms. The project stems from creative direction by Rono Origuchi with visual development overseen by Hiroki Hasegawa. This complimentary Android application delivers authentic Japanese card gaming interaction, functioning on Android operating systems and above while incorporating networked multiplayer functionality for rival competition. The experience introduces captivating entities termed Eto Girls, inspired by Eastern zodiac traditions, with whom players engage throughout their journey. The implementation preserves classical Koi-Koi mechanics, accommodating both newcomers and seasoned participants. Featuring Japanese-inspired visual design and captivating interaction, the title delivers a distinctive card gaming adventure. Whether seeking to master Hanafuda mechanics or desiring entertainment during leisure hours, this offering proves an excellent selection.