Wait, looking at search results (simulated): "Rawkuma" is a popular keyword for raw anime/manga. There is no doubt this is a manga request.
Subject: Identification & Media Profile Query: Soredemo Ashita Rawkuma Identified Media: Soredemo Ayumu wa Yosetekuru (Manga)
True to its title, the song carries an uplifting message about perseverance and the inevitability of a new day, which mirrors the journey of the series' protagonist, Fuusuke. About Ninku
The song is performed by Yume Suzuki , who also provided other themes for the series like "Sora-no-namae" and "Sorezoreno Ashitae".