Renai Gengogaku

From mangaupdates.com:

Because of the two senpais passionate affections towards each other, there isn’t any new recruit for the Archery Club. As a result, the club might be disbanded. However, there might be hope if the two freshmen, who have been studying archery for over ten years, join the club. Will the boys agree to join a club that has only three members and without a consultant? And will their relationship advance to the next stage? Includes a one-shot of a sweet love confession between a sensei and an intern.