Kahogo de Ecchi na Boku no Ane

Kahogo de Ecchi na Boku no Ane is a Japanese hentai visual novel themed around the fetish of adult breast feeding. The player controls Shōgo Kuragano, a young man who lives alone with his four older sisters: the motherly Hitoha, the sporty Niina, the studious Misora, and the mischievous Shio. Shōgo's life takes a drastic turn when he is diagnosed with a rare illness that prevents him from growing at the same rate as a normal person, which his doctor suggests may have been caused by a lack of breast milk during his infancy. When Shōgo relays this diagnosis to his sisters, they take it upon themselves to try to cure his condition by supplying him with breast milk, and not just any breast milk — their own. The more time Shōgo spends being "treated" by his sisters, the more their relationship starts to become sexual.

Like most visual novels, the gameplay consists of reading through the story conveyed through text overlaid on illustrated backgrounds and characters represented by static sprites. Occasionally, the background and sprites will be replaced by a full-screen "CG" image depicting a certain event (such as a sex scene). At specific intervals, the player is prompted to choose one of several options on screen which may influence the direction of the story. The game features Japanese voice acting for all four of the Karugano sisters.