Isobe Isobee Monogatari: Ukiyo wa Tsurai yo (2015)

Isobe Isobee is a lazy, slacker samurai with big dreams. He lives with his mother, who thinks highly of him. He lays around the house, sneakily looks at Edo-period pornography without his mother noticing, naps at school... but he plans to become a respectable samurai one day!

(Source: MangaHelpers)