https://read.futekiya.com/comic/5fc99fa327153
https://mangaowl.net/single/63889/pink-heart-jam?__cf_chl_jschl_tk__=00972d6bfaffd5920065187fd2658ff13f5919d6-1623939397-0-AfTeAJhc3BEOiFlffDkBI_RhdN6wyU2sjAhkwrg7DI69EFWzcXQzbHoJjgvNmaQHDAYRhx0hjYq3KlfTPqcME_NC4QChiupLQSUTYQvcnH-uUC2KXvO6DRhl-jXG1DkJOjp3bYYN-FegtcBwWY9-n41A13ErRPuy5GUYcfC1CGg-ccw0LbWDIlD3WmdawlaI7bShlo4AnNun9wAdFWZLNSsS43WvF7qjqwHPL1pOxCqKCbj6yLVazU359CbkttrhtHKh9rqBGiGYKEWwIrr27MKoq-YmvFqqS6Dh2fsGhOkWqmyuLf_GMatB9ZlI_WTTJTxzb_ey
Volume 2
This and sequel
https://www.cmoa.jp/title/212782/
Volume 4
Sequel bitter cigar
Koisuru Ryuu no Shima