Watanabe Mako is a screenwriter. She studied script writing at the Scenario Center and won the grand prize at the 4th TBS Drama Scenario Awards in 2014. She made her screenwriting debut in 2014 TBS Special Drama "Kono Misuteri ga Sugoi! ~ Besutosera Sakka kara no Chousenjou ~" under the sub-part story "Nokosareta Senritsu"
| Movie | 凜-りん- | 2019 |
| Movie | 余命10年 | 2022 |
| Series | 理想ノカレシ | 2022 |
| Movie | This Mystery is Excellent! ~ Challenge from Bestseller Writer | 2014 |