LadyBelle's manga / #3P(139)

1. School prince is sex friend with plain boy just until he gets girlfriend, but when has a chance to get a girl, realizes he's in love with the friend. 2. boy gets a love letter in his locker, but instead of being from a cute girl, it's from a member of the kendo club. 3. guy falls in love with his glasses wearing coworker, and his much younger, glasses wearing friend. Neither seems interested in sharing him, much to his disappointment 4. an ex comes to visit man in the city. One thinks about getting back together, the other doesn't realize they ever broke up 5. Coworkers and lovers get a little too busy at work to pay attention to each other, so one is tempted to cheat.