Osamu is the protagonist of the story, and he always has a sister complex. He has taken care of his little sister, Rio, from the moment she was born, as well as his other sister, Mio, since she joined his family from his father’s remarriage. Every day he was on cloud nine being together with his two younger sisters. Finally came the day when they started attending the nearby school that he also went to. When he saw them in their school uniforms for the first time, his heart started beating faster as he gazed upon their slightly matured figures. Could it be love? Yes, he had begun to have a (sexual) affection for them. [From Hau~ Omochikaeri!]
Onii-chan Daisuki! 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 |
|---|---|---|---|
| Middle School Student Heroine | 2.50 | 2.37 | 5.93 |
| Highly Animated Sprites | 3.00 | 1.86 | 5.57 |
| Changeable Font | 3.00 | 1.75 | 5.26 |
| Only Loli Heroines | 2.83 | 1.78 | 5.03 |
| Social Networking Service | 2.00 | 2.46 | 4.91 |
| Siscon Protagonist | 2.25 | 2.05 | 4.61 |
| Perverted Protagonist | 2.50 | 1.65 | 4.13 |
| Panchira | 2.00 | 2.06 | 4.11 |
| Blood-related Brother/Sister Incest | 2.75 | 1.49 | 4.09 |
| Brother/Sister Incest | 2.00 | 2.04 | 4.09 |
| Inbreeding | 2.00 | 1.98 | 3.97 |
| Sex with Sleepers | 2.00 | 1.90 | 3.81 |
| Brocon Heroine | 2.25 | 1.61 | 3.62 |
| Protagonist's Non-blood-related Sister as a Heroine | 2.00 | 1.75 | 3.50 |
| Legwear Footjob | 2.00 | 1.62 | 3.25 |
| Non-blood-related Brother/Sister Incest | 1.80 | 1.77 | 3.18 |
| High Sexual Content | 2.80 | 1.05 | 2.95 |
| Only Virgin Heroines | 2.67 | 1.08 | 2.89 |
| Single Footjob | 2.00 | 1.37 | 2.74 |
| Pregnant Sex | 2.00 | 1.18 | 2.36 |
| Loli Heroine | 1.71 | 1.19 | 2.04 |
| Nukige | 3.00 | 0.65 | 1.95 |
| Nameable Protagonist | 2.00 | 0.91 | 1.82 |
| Defloration | 2.00 | 0.76 | 1.52 |
| Male Protagonist | 2.75 | 0.30 | 0.83 |
| ADV | 2.00 | 0.14 | 0.29 |
| Name | Characters | Importance | Weight |
|---|---|---|---|
| Petting With Object Engages in (Sexual) | 1 | 3.38 | 2.34 |
| Desu Personality | 1 | 2.78 | 1.93 |
| Step Sister Role | 1 | 2.43 | 1.69 |
| Non-blood-related Brother Role | 1 | 2.38 | 1.65 |
| Sister Complex Personality | 1 | 2.38 | 1.65 |
| Pissing Engages in (Sexual) | 2 | 1.47 | 1.61 |
| Swimsuit Clothes | 1 | 2.28 | 1.58 |
| Pregnancy Subject of | 2 | 1.40 | 1.54 |
| Reverse Cowgirl Engages in (Sexual) | 1 | 2.22 | 1.54 |
| Inbreeding Engages in (Sexual) | 1 | 2.21 | 1.53 |
| Non-blood-related Incest Engages in (Sexual) | 1 | 2.15 | 1.49 |
| Book Items | 1 | 2.12 | 1.47 |
| Brother Complex Personality | 1 | 2.06 | 1.43 |
| Sharp-tongued Personality | 1 | 1.98 | 1.37 |
| Full Brother Role | 1 | 1.95 | 1.35 |
| Assertive Personality | 1 | 1.94 | 1.34 |
| Curious Personality | 1 | 1.92 | 1.33 |
| Hidden Eyes | 1 | 1.80 | 1.25 |
| Side Tail Hair | 1 | 1.75 | 1.21 |
| Missionary Engages in (Sexual) | 1 | 1.74 | 1.21 |
| Older Brother Role | 1 | 1.73 | 1.20 |
| Footjob Engages in (Sexual) | 1 | 1.72 | 1.19 |
| Virgin Sex Engages in (Sexual) | 3 | 0.85 | 1.18 |
| Stubborn Personality | 1 | 1.68 | 1.16 |
| Vaginal Masturbation Engages in (Sexual) | 1 | 1.67 | 1.16 |
| Full Sister Role | 1 | 1.56 | 1.08 |
| Hard Worker Personality | 1 | 1.54 | 1.07 |
| Sex while Being Pregnant Engages in (Sexual) | 1 | 1.53 | 1.06 |
| Incest Engages in (Sexual) | 1 | 1.47 | 1.02 |
| Younger Sister Role | 1 | 1.45 | 1.00 |
| Hair Tie Clothes | 1 | 1.41 | 0.98 |
| Hairpin Clothes | 1 | 1.40 | 0.97 |
| Blunt Bangs Hair | 1 | 1.40 | 0.97 |
| Friendly Personality | 1 | 1.22 | 0.84 |
| Blowjob Engages in (Sexual) | 2 | 0.76 | 0.84 |
| Friend Role | 1 | 1.20 | 0.83 |
| School Uniform Clothes | 2 | 0.76 | 0.83 |
| Violet Hair | 1 | 1.20 | 0.83 |
| Anal Sex Subject of (Sexual) | 1 | 1.19 | 0.82 |
| Long Hair | 2 | 0.75 | 0.82 |
| Handjob Engages in (Sexual) | 1 | 1.16 | 0.80 |
| Ponytail Hair | 1 | 1.10 | 0.76 |
| Amber Eyes | 1 | 1.03 | 0.72 |
| Kind Personality | 1 | 1.03 | 0.71 |
| Green Eyes | 1 | 1.02 | 0.71 |
| Doggy Style Subject of (Sexual) | 1 | 0.92 | 0.64 |
| Shoulder-length Hair | 1 | 0.92 | 0.64 |
| Brown Eyes | 1 | 0.90 | 0.62 |
| Blond Hair | 1 | 0.89 | 0.62 |
| Blue Eyes | 1 | 0.80 | 0.56 |
| Brown Hair | 1 | 0.68 | 0.47 |
| Short Hair | 1 | 0.61 | 0.42 |
| Slim Body | 1 | 0.58 | 0.40 |
| Pale Body | 1 | 0.37 | 0.25 |