"Cy-Believers" 4 volumes-ongoing by Shioko Mizuki
As a new student Rui plans on joining school clubs but her bully fiance is the destroying all the clubs. Thus with some of the students they form an unstoppable club called "Computer Believers".
Just like "Love Master A", I saw a review describing this as a reverse harem. The preview is too vague to tell if it is, but if you want to check it it's on GoComi .