They actually look like brothers when Taro takes off his glasses! Also, to clarify, Taisei isn't related to them, he's their roommate.
BUT WHO IS THIS MYSTERIOUS YUUDAI?
Next strip is the last in the chapter omgggggg a comic strip with chapters I am so edgy. I got this one and the next done tonight so I could have an even 24 for my next batch of printed Sakana minicomics. I'll be selling them at the Sequa Swap Meet (Norris Hall) and Shoujo Phonebook's Artist Alley (Student Center) on Friday and Saturday respectively if you go to my school or are in the area (or haven't already purchased one of the other printings :U)
Uploading 24 tomorrow! New friends, enemies and frenemies in chapter 2! STAY TUUUUNED!