Majime Girl to Seishun Lingerie by Tachi — Ongoing

Also known as Serious Girl and Youthful Lingerie

1
Volume 1
Chapter 1 released Sep 30 '21
Chapter 2 released Oct 14 '21
Chapter 3 released Oct 25 '21
Chapter 4 released Nov 9 '21
Chapter 5 released Jan 7 '22
Chapter 6 released Feb 1 '22
Chapter 7 released Mar 30 '22
Chapter 8 released Jun 21 '22
Chapter 9 released Jan 30 '23
Volume 2
Chapter 10 released Jun 8 '23
Chapter 11 released Aug 15 '23
Chapter 12 released Oct 9 '23 Beach Swimsuits
Chapter 13 released Dec 18 '23