Sayonara Isekai, Matakite Ashita: Tabisuru Efude to Backpack 30

The world he woke up in is long dead, dusted in ashen powder, and yet Keisuke still sees splashes of color as he travels through it. Deserted as this world may seem, might he be able to find something out there in the emptiness?

(Source: J-Novel Club)