Season
- Season 1 2023-01-05
Episode
- Episode 1: Mahiro's Confusing New Body
- Episode 2: Mahiro's Time of the Month
- Episode 3: Mahiro's Close Encounter
- Episode 4: Mahiro's New Friend
- Episode 5: Mahiro Discovers Adventure and Social Gatherings
- Episode 6: Mahiro Goes Back to Middle School
- Episode 7: Mahiro's Role-Playing Game
- Episode 8: Mahiro's First Girls Sleepover
- Episode 9: Mahiro Rings in the New Year
- Episode 10: Mahiro Ponders Boobs and Identity
- Episode 11: Mahiro Pretties Up
- Episode 12: Mahiro's Future as a Sister
ONIMAI: I'm Now Your Sister! Season 1 Mahiro's Confusing New Body
When lazy, erotic-game loving Mahiro Oyama is transformed into a girl by his younger scientist sister's experiments, he becomes determined to change back, only to recognize that with his new opportunity, he may want to turn his life around.
