"Real English 21-tag along"

"tag along" means "go together or "go with."

Refer to the below dialogues:

Ms. T:  I am going to Okinawa over summer vacation with my friends.  

How about you, Glenn?  Do you have any plans?

Glenn:  Actually, I am a little embarrassed, but no I don't.

Do you mind if I tag along?

Ms. T:  Absolutely not!  The more the merrier!

Glenn: Thanks a lot! I really appreciate it!

The first photo below is of Zamami Island, which is a short-ferry ride from the main island of Okinawa.  The second photo is of some hand-made "Shisa."  I have a pair in the entrance-way of my house, and also of the classroom.  For your reference, here is the official definition of Shisa on Wikipedia:

"Shisa (シーサー) (Okinawan: siisaa) (shishi or shisaa) is a traditional Ryukyuan decoration, often in pairs, resembling a cross between a lion and a dog, from Okinawan mythology. People place pairs of shisa on their rooftops or flanking the gates to their houses. Shisa are wards, believed to protect from some evils. When in pairs, the left shisa traditionally has a closed mouth, the right one an open mouth.[1] The open mouth wards off evil spirits, and the closed mouth keeps good spirits in.

In mainland Japan, similar pairs now known as "guardian dogs" were once called "shisa and guardian dogs": the right with its mouth opened is the guardian, the left with its mouth closed is the shisa. From the Edo period they started to be called "guardian dogs" in general in mainland Japan.[2] Gender is variously assigned to the shisa. Some Okinawans believe the male has his mouth closed to keep bad out of the home, while the female has her mouth open to share goodness.[3] Others believe the female has her mouth closed to "keep in the good", while the male has his mouth open to "scare away the bad".[4] (Compare this to the distinction between male and female guardian lions in Chinese culture.)

The shisa, like the komainu (lion dogs), are a variation of the guardian lions ("fu dogs") from China.[5] The shisaa, or lion dog, is an Okinawan cultural artifact. In magic typology, they might be also be classified as gargoyle beasts. They are traditionally used to ward off evil spirits."