What the title says.

30-year-old systems engineer Haruki is overworked, clumsy and a person who is hard on himself and others. One day, he meets the kindly Katsumi, a... more>> 52-year-old gentleman who takes care of him when he was about to pass out. Haruki ends up asking him: ‘Please be my papa!’ and surprisingly, Katsumi agrees! As a pseudo 'father-son’, the two go to the zoo, a fireworks display etc so Haruki can have the experiences he missed out on during childhood. <<less

Original art of Ogawa Chise released on Twitter.

The manga's story is set in Blood Night town, a place where vampires seeking blood and humans looking for blood buyers gather. Sotetsu, a human who is branded as "wasted blood," or a blood that no one wants, works for an organization that cracks down on vampires' illegal activities, called the Blood Control Bureau. One day, Sotetsu meets a mysterious vampire who claims to be a food (or blood) connoisseur. A suspenseful battle of courtship and salvation begins. ... more>>

Source: ANN <<less