Yamada to Kase-san by Takashima Hiromi — Ongoing

Its

Sequel to Kase-san series: https://dynasty-scans.com/series/kase_san
Serialized in Wings magazine and published online on Web Wings: http://www.shinshokan.com/webwings/title43.html

Chapter 1: Dianthus and Kase-san released May 8 '17
Chapter 2: Sunflowers and Kase-san released Oct 25 '17
Chapter 3: Powdery Snow and Kase-san released Mar 18 '18
Chapter 4: Lipstick and Kase-san released Apr 5 '18
Chapter 5: Straw Hat and Kase-san released Jun 24 '18
Chapter 6: Phone and Kase-san released Aug 12 '18
Valentine and Kase-san released Aug 12 '18 Valentine's
Chapter 7: Roommate and Kase-san released Dec 12 '18
Chapter 8: Ginger ale and Kase-san released Feb 21 '19
Chapter 9: Bouquet and Kase-san released Mar 27 '19
Chapter 10: Birthday and Kase-san released May 30 '19 Birthday
Chapter 11: Rival and Kase-san released Aug 10 '19
Chapter 12: Fireworks and Kase-san released Oct 4 '19
Chapter 13: Tapioca and Kase-san released Nov 25 '19
Lights out and Kase-san released Feb 22 '20
Chapter 14: Moonlit Night and Kase-san released Apr 6 '20
Golden Week and Kase-san released May 1 '20
Chapter 15: Beachball and Kase-san released May 24 '20 Beach Swimsuits