Furetai Bokura to Himitsu no Rule

On the first day of the new school year, Yuusei is surprised when his classmate Shizuka suddenly collapses right in front of him. It turns out that Shizuka faints every time their eyes meet, a reaction stemming from Yuusei’s own behavior. Feeling responsible, Yuusei proposes they train together to find a solution. After trying various methods, they discover that the only way Shizuka can maintain his composure during eye contact is if Yuusei is restrained and unable to move his hands!

(Source: Kasakura Publishing, translated)

Note: Chapter count includes an extra.