One ☆ Boku - Faraway so close! ~Onee-chan to Boku~

The story is set in Komine village where most residents share the Komine surname, fostering a strong sense of family. The protagonist, Komine Kenjirou, comes from a family with roots in this village. His father, the second son of a family of three siblings, left the village to attend university. Kenjirou would visit his extended family during long breaks, but as his father's work became busier, their connection to the village faded. However, after 10 years, prompted by the request of his parents working overseas, Kenjirou returns to the village for a summer visit, involving a visit to the family grave and greetings to the villagers.
In the village, he reunites with four "older sisters" he used to play with in his childhood (these "sisters", while not blood-related, are referred to as "sister-like" figures). They include his stepsister Mitsuru, cousin sisters Natsuko and Akina, and older childhood friend Chiri.
The game's theme is romance, focusing on the affectionate relationships between Kenjirou and these sister-like characters. The game primarily emphasizes light-hearted and cheerful interactions, with the heroines having maximum likability from the start and a focus on enjoying moments of love and pampering.

[Translated from Getchu and partially from Mediaclip]