学生時代はこういうネタで笑っていたけど社会人になってからは笑えなくなってきたので初投稿です

I used to laugh about stuff like this during my school days. Ever since i became a member of society i no longer laugh about it. It's my first post. "This is my first post" is a jargon/meme phrase in Manatsu no Yo no Inmu community.