Akira's father, an archeologist, has remarried, giving him a new stepmother and three stepsisters, Yuki, Nana and Miu. While on his honeymoon, Akira's father makes an archeological find and decides to stay on site in order to supervise and leaving Akira at home alone with his new family members. After being discovered in bed with Yukie, his stepmother, Akira finds a box containing a scroll and three bottles. Using the knowledge his father taught to him, he reads the Sumarian language on the scroll and finds himself in a contract with the goddess Inana, who tells him to collect the love juices of his sisters in the bottles before the next full moon or else a terrible horror will befall him.
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| Name | Characters | Importance | Weight |
|---|---|---|---|
| Step Sister Role | 3 | 2.43 | 3.37 |
| Group Sex of Several Females Engages in (Sexual) | 3 | 2.28 | 3.17 |
| Non-blood-related Incest Engages in (Sexual) | 3 | 2.16 | 2.99 |
| Incest Engages in (Sexual) | 4 | 1.47 | 2.36 |
| Group Sex of One Male and Several Females Engages in (Sexual) | 6 | 1.17 | 2.29 |
| Full Sister Role | 3 | 1.57 | 2.17 |
| Lesbian Sex Engages in (Sexual) | 3 | 1.38 | 1.91 |
| Step Brother Role | 1 | 2.73 | 1.89 |
| Small Breasts Body | 2 | 1.67 | 1.83 |
| Pantyjob Engages in (Sexual) | 1 | 2.60 | 1.80 |
| Ribbon Headband Clothes | 1 | 2.45 | 1.70 |
| Amber Eyes | 4 | 1.03 | 1.66 |
| Non-blood-related Mother Role | 1 | 2.37 | 1.65 |
| Braided Crown Hair | 1 | 2.36 | 1.64 |
| Cunnilingus Subject of (Sexual) | 3 | 1.16 | 1.61 |
| Seventh Posture Subject of (Sexual) | 2 | 1.46 | 1.60 |
| Twin Blowjob Engages in (Sexual) | 2 | 1.45 | 1.59 |
| Masturbation Engages in (Sexual) | 2 | 1.39 | 1.53 |
| Footjob Subject of (Sexual) | 1 | 2.18 | 1.51 |
| Kid Body | 2 | 1.37 | 1.50 |
| Tominagi Subject of (Sexual) | 2 | 1.36 | 1.49 |
| Off-The-Shoulder Shirt Clothes | 1 | 2.15 | 1.49 |
| Doggy Style Subject of (Sexual) | 4 | 0.93 | 1.49 |
| Pink Hair | 2 | 1.33 | 1.46 |
| Sixty-nine Engages in (Sexual) | 2 | 1.26 | 1.38 |
| Dress Clothes | 2 | 1.25 | 1.37 |
| Taciturn Personality | 1 | 1.94 | 1.35 |
| Straight Hair | 3 | 0.95 | 1.31 |
| Ribbon Hair Tie Clothes | 2 | 1.19 | 1.31 |
| Naked Apron Clothes | 1 | 1.87 | 1.30 |
| Hat Clothes | 1 | 1.83 | 1.27 |
| Bob Cut Hair | 1 | 1.82 | 1.26 |
| Hidden Eyes | 1 | 1.81 | 1.25 |
| Blowjob Engages in (Sexual) | 4 | 0.76 | 1.23 |
| Pajamas Clothes | 1 | 1.75 | 1.21 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Virgin Sex Engages in (Sexual) | 3 | 0.85 | 1.18 |
| Boobjob Engages in (Sexual) | 2 | 1.07 | 1.17 |
| Miniskirt Clothes | 2 | 1.06 | 1.17 |
| Intake Hair | 1 | 1.67 | 1.16 |
| Ribbon Hair Accessory Clothes | 1 | 1.65 | 1.15 |
| Mini-dress Clothes | 1 | 1.64 | 1.13 |
| Maid's Headdress Clothes | 1 | 1.63 | 1.13 |
| Shy Personality | 1 | 1.62 | 1.12 |
| Blowjob Subject of (Sexual) | 1 | 1.52 | 1.06 |
| Cowgirl Subject of (Sexual) | 2 | 0.95 | 1.05 |
| Maid's Dress Clothes | 1 | 1.51 | 1.05 |
| Orange Hair | 1 | 1.51 | 1.05 |
| Slim Body | 5 | 0.58 | 1.03 |
| Pissing Engages in (Sexual) | 1 | 1.46 | 1.02 |
| Mother Role | 1 | 1.46 | 1.01 |
| Not a Virgin Role | 1 | 1.42 | 0.99 |
| Tank Top Clothes | 1 | 1.42 | 0.98 |
| Bathroom Sex Engages in (Sexual) | 1 | 1.39 | 0.96 |
| Red Hair | 1 | 1.32 | 0.92 |
| Waist Length+ Hair | 2 | 0.81 | 0.89 |
| Parted in Middle Hair | 1 | 1.25 | 0.87 |
| Friend Role | 1 | 1.20 | 0.83 |
| Red Eyes | 1 | 1.20 | 0.83 |
| Blue Hair | 1 | 1.19 | 0.83 |
| Standing Sex Subject of (Sexual) | 1 | 1.18 | 0.82 |
| Big Breasts Body | 1 | 1.14 | 0.79 |
| Twin Tails Hair | 1 | 1.13 | 0.78 |
| Ponytail Hair | 1 | 1.10 | 0.76 |
| Vaginal Fingering Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Sitting Sex Subject of (Sexual) | 1 | 1.06 | 0.74 |
| Thigh-high Stockings Clothes | 1 | 1.04 | 0.72 |
| Kind Personality | 1 | 1.03 | 0.71 |
| Teen Body | 2 | 0.62 | 0.68 |
| Sidehair Hair | 1 | 0.98 | 0.68 |
| Short Hair | 2 | 0.61 | 0.67 |
| Pale Body | 5 | 0.37 | 0.66 |
| Shoulder-length Hair | 1 | 0.92 | 0.64 |
| Young-adult Body | 1 | 0.76 | 0.53 |
| Long Hair | 1 | 0.75 | 0.52 |
| Brown Hair | 1 | 0.68 | 0.47 |