Shiro is the credited creator of the Encouragement of Climb (Yama no Susume) franchise, a series that originated as a manga before being adapted into multiple anime television seasons and original video animations.

The original manga began serialization in Earth Star Entertainment's Comic Earth Star magazine with its first chapter appearing on August 12, 2011. As of December 2023, the series has been compiled into 25 collected volumes. The manga is described as a slice-of-life and adventure series focusing on mountaineering.

The anime adaptations were produced by the studio Eight Bit, with Yusuke Yamamoto serving as director across all installments. The franchise includes the first season which aired from January to March 2013, a second season from July to December 2014, an original video animation titled Encouragement of Climb: Omoide Present released in October 2017, a third season from July to September 2018, and a fourth season titled Encouragement of Climb: Next Summit which aired from October to December 2022.

In all anime productions, Shiro is consistently credited for the original work, with the credits on the series listing the creator for the original manga. The anime's official credits also list Shiro as the original character designer.

The Encouragement of Climb series represents a significant body of work within the slice-of-life and adventure genres, with the franchise spanning over a decade of continuous publication and adaptation. The series focuses on themes of friendship, personal growth, and outdoor recreation, centered on mountain climbing. Shiro's work on this series demonstrates a sustained creative contribution to a single property across both manga and anime formats.