Ken has a beautiful mother and loves her very much. His father is gone away for the business. One day, Ken invites his best friend, Tomoya to his house and presents his mother. Ordinary daily life and action... However, a tragedy starts from here... [From DLsite English]
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Okaa-san no Himitsu has not appeared in our Steam sample enough to calculate it's similar novels... sorry!
A novel needs atleast 20 owners before it's similarity is calculated.
| Name | Score | Importance | Weight |
|---|---|---|---|
| Netorare | 3.00 | 1.52 | 4.55 |
| Changeable Font | 2.00 | 1.79 | 3.57 |
| Reverse Missionary | 2.00 | 1.68 | 3.36 |
| Only a Single Heroine | 3.00 | 1.04 | 3.11 |
| Ejaculation Choice | 2.00 | 1.53 | 3.05 |
| Heroine Having Sex with Others | 2.00 | 1.52 | 3.04 |
| Only Adult Heroines | 2.00 | 1.52 | 3.03 |
| Married Heroine | 2.00 | 1.41 | 2.83 |
| Few Choices | 2.00 | 1.34 | 2.68 |
| Sounds of Copulation | 2.00 | 1.28 | 2.55 |
| Nose Hook | 1.00 | 2.44 | 2.44 |
| Early Sexual Content | 2.00 | 1.22 | 2.43 |
| Bathroom Sex | 2.00 | 1.18 | 2.37 |
| Group Sex of One Female and Several Males | 2.00 | 1.06 | 2.13 |
| Naked Sprites | 2.00 | 1.05 | 2.10 |
| High Sexual Content | 2.00 | 1.03 | 2.07 |
| Blood-related Mother/Son Incest | 1.00 | 1.84 | 1.84 |
| Double Handjob | 1.00 | 1.63 | 1.63 |
| Double Penetration (Group Sex) | 1.00 | 1.44 | 1.44 |
| Vaginal Masturbation | 1.00 | 1.39 | 1.39 |
| Reverse Cowgirl | 1.00 | 1.32 | 1.32 |
| Nukige | 2.00 | 0.64 | 1.29 |
| Multiple Penetration | 1.00 | 1.25 | 1.25 |
| Sexual Content | 2.00 | 0.61 | 1.23 |
| Bukkake | 1.00 | 1.19 | 1.19 |
| Anal Sex | 1.00 | 1.15 | 1.15 |
| Quickie Fix Position | 1.00 | 1.11 | 1.11 |
| Bondage | 1.00 | 1.09 | 1.09 |
| Sitting Sex | 1.00 | 1.05 | 1.05 |
| Single Blowjob | 1.00 | 0.99 | 0.99 |
| Cowgirl | 1.00 | 0.83 | 0.83 |
| Multiple Endings | 1.00 | 0.66 | 0.66 |
| ADV | 2.00 | 0.14 | 0.29 |
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Nose Hook Subject of (Sexual) | 1 | 2.69 | 1.87 |
| Ring Clothes | 1 | 1.97 | 1.36 |
| Infidelity Engages in | 1 | 1.82 | 1.26 |
| Multiple Penetration Subject of (Sexual) | 1 | 1.75 | 1.21 |
| Teasing Subject of | 1 | 1.68 | 1.16 |
| Reverse Cowgirl Subject of (Sexual) | 1 | 1.64 | 1.14 |
| Sweater Clothes | 1 | 1.64 | 1.14 |
| Bondage Sex Subject of (Sexual) | 1 | 1.56 | 1.08 |
| Wife Role | 1 | 1.55 | 1.07 |
| Big Breast Sizes Body | 1 | 1.47 | 1.02 |
| Group Sex Engages in (Sexual) | 1 | 1.45 | 1.00 |
| Headband Clothes | 1 | 1.44 | 1.00 |
| Nipple Sucking Subject of (Sexual) | 1 | 1.39 | 0.96 |
| Masturbation Engages in (Sexual) | 1 | 1.37 | 0.95 |
| Ahegao Engages in (Sexual) | 1 | 1.33 | 0.92 |
| Curtained Hair | 1 | 1.30 | 0.90 |
| Butterfly Subject of (Sexual) | 1 | 1.17 | 0.81 |
| Handjob Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Vaginal Fingering Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Quickie Fix Subject of (Sexual) | 1 | 1.08 | 0.75 |
| Parted to Side Hair | 1 | 1.07 | 0.74 |
| Miniskirt Clothes | 1 | 1.07 | 0.74 |
| Sitting Sex Subject of (Sexual) | 1 | 1.05 | 0.73 |
| Cowgirl Subject of (Sexual) | 1 | 0.95 | 0.66 |
| Brown Eyes | 1 | 0.90 | 0.62 |
| Young-adult Body | 1 | 0.77 | 0.53 |
| Blowjob Engages in (Sexual) | 1 | 0.76 | 0.53 |
| Long Hair | 1 | 0.75 | 0.52 |
| Brown Hair | 1 | 0.68 | 0.47 |