From Shinmakoku Scanlations:
The manga is a continuation story from a BL (Boys Love) game under the same title.
1-2) A Distance Between Words and Heart
Nishida Yuuto got his first male lover, Kobayakawa Ryuuji, an ex-host. However, he's unsure whether this relationship is strong, or if he's only being toyed with.
3-4) The Clumsy Darling
Aoi Satoru is now Kishimoto Takami's lover... Can he trust Takami, who has such a dirty past...?

Quiet, sweet story of an emotionally shuttered university sempai and his conversationally clumsy junior. Sharing the same last name and a love for classical music brings them together a little. But will this be enough to bridge the gap between the sempai's secret sorrow and the junior's awkward naivete?