Hatsukoi Jikan documents the erotic coming-of-age story of a young man who moves in with the three beautiful Hiiragi sisters: the mature and nurturing older sister Ayane, the feisty tsundere middle sister Kotone, and the shy, innocent younger sister Suzune. What begins as a simple living arrangement quickly dissolves into a torrent of incestuous lust and sexual exploration. The series wastes no time thrusting the protagonist into intensely pornographic situations with each sister. Viewers will witness him eagerly fucking Ayane's dripping wet cunt in secret encounters, submitting to Kotone's aggressive sexual demands as she rides his hard cock, and tenderly deflowering the virginal Suzune, filling her tight pussy with his warm cum for the first time. The arc progresses from individual sexual trysts to explosive group encounters, culminating in debaucherous threesomes and foursomes where every hole is filled and every character is glazed in cum. Each episode is a detailed depiction of raw, unrestrained fucking, deep-throating, and multiple creampies, exploring the taboo fantasy of a house filled with insatiable, fuck-hungry stepsisters.