Hana no Arika

Mitsurou is on the verge of giving up on his dream of becoming a novelist. Maho can't stay away from her former lover. "Sensei" has trouble with his wife when their cat dies. From reunions to rebirths. Time, which had stopped, begins to move again, as if to reclaim "us" who had been lost—because we can't stay children forever.

(Source: Kadokawa, translated)

Included one-shot:
Volume 2: Riri Yuuten