Tamaki who becomes a surrogate mother for the sake of her elder brother, Satoshi, who is gay by going through artificial insemination using his partner Keito's sperm with her egg and the siblings wanting to reveal the truth to their parents after her pregnancy passes the first trimester.
| Actor | Role |
|---|---|
 Mayu HottaEjima Tamaki | Ejima Tamaki |
 Yoshihiko HosodaEjima Satoshi | Ejima Satoshi |
 Kenta IzukaMizuno Keito | Mizuno Keito |
 Hajime InoueNot listed | Not listed |
 Sanae MiyataNot listed | Not listed |
 Takumi SaitohNot listed | Not listed |
 Wakana MatsumotoNot listed | Not listed |
 Kentaro TamuraNot listed | Not listed |
| KKeiko KatsukuraNot listed | Not listed |
 Haruto ShiratoriNot listed | Not listed |
| RRiki OhkandaNot listed | Not listed |