Hajimete Koibito ga Dekimashita.

Ayumi and Senpai, who have just started going out, are constantly bewildered by the challenges of dating, kissing, and everything else for the first time. Sometimes they are too reserved, and sometimes they try to be bold, but as they try, the distance between them slowly grows closer. ......
Over 150,000 likes per episode on Twitter!
A story about two lovers who are too pure!
We will show you their innocent progress as they try their best to love each other.
(Source: Comic POOL, translated)
Note: The manga was originally a Twitter series picked up for serialization by Comic POOL (Ichijinsha). Includes one bonus chapter.