The childhood friend heroine who punched the harem protagonist in the face ends up happy with a frivolous senior.

Roughly as the title suggests. A story where a harem-minded childhood friend actually builds a harem and makes his childhood friend heroine (who was properly dating him) cry. She then meets a senior who seems like a tactless playboy, punches the harem protagonist in the face, and becomes happy. This work is loosely connected to the author's short story, "I Tried My Best to Guard a Childhood Friend Who Seemed Easy to Cuckold." If you'd like, please check that one out too.